3. Structure, Function, and Genetics of Plants and Animals
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1 3. Structure, Function, and Genetics of Plants and Animals
2 3.1 Structure of Plants 3.2 Plant Physiology and Reproduction 3.3 Structure and Function of Animal Tissues
3 3.4 Anatomy of Animal Systems, Part Anatomy of Animal Systems, Part Homeostasis, Hormones, and Reproduction
4 3.7 Principles of Genetics 3.8 Modern Genetics and Inheritance
5 3.1 Structure of Plants
6 How are species of the plant kingdom classified? There are three common methods, based upon their physical characteristics.
7 Vascular plants (tracheophytes) are able to move water and nutrients throughout their structure with specialized tissues (xylem and phloem). Non-vascular plants (bryophytes) do not have tissue to move water and nutrients throughout their structure.
8 A second method of classification is by growing season. Annuals only survive a single growing season, while biennials have a life cycle that spans two growing seasons. Perennials continue to grow year after year.
9 Plants can also be classified by their method of reproduction. Plants that produce flowers are called angiosperms, while those that produce seeds without flowers are called gymnosperms.
10 Angiosperms and gymnosperms differ in stem structure and reproductive organs. Gymnosperms are mostly trees that produce seeds or cone-like structures.
11 Stem Angiosperm Structure
12 Pistil Stamen Fruit is a mature ovary and contains the seeds. Each seed contains a plant embryo, a store of food, and a protective seed coat. Under the right conditions, it will germinate (sprout).
13 The stem provides the main structural support of the plant, as well as producing leaves and branches. It also acts as the primary conduit for transport of nutrients and water throughout the plant.
14 Moves water up from the roots Moves sugars down from the leaves
15 The leaves act as the primary sites for photosynthesis in the plant. Leaves are attached to a branch or stem by a petiole, which connects the veins in the leaf to the stem.
16
17
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19 3.2 Plant Physiology and Reproduction
20 Vascular plants (tracheophytes) are able to move water and nutrients throughout their structure with specialized tissues (xylem and phloem). Non-vascular plants (bryophytes) do not have tissue to move water and nutrients throughout their structure.
21 Since plants can synthesize their own sugars for food, the bulk of plant physiology is aimed toward obtaining CO 2, water, and minerals from their environment.
22 Moves water up from the roots Moves sugars down from the leaves
23 Water is especially important, as it needs to be able to travel from the roots to the top of the plant through the xylem.
24 Plants can synthesize their own sugars for food in their leaves, but these sugars need to be able to move out of the leaves and throughout the rest of the plant. This is accomplished by taking advantage of a concentration gradient between the phloem and the stem.
25
26
27 Plants alternate between haploid (n) and diploid (2n) phases in their life cycle. The diploid generation is the sporophyte, and produces haploid gametophytes. The male gametophyte produces sperm, and the female an egg cell, which together can form a zygote.
28 The diploid generation is the sporophyte, and produces haploid gametophytes, which may be male or female. The male gametophyte produces sperm, and the female an egg cell, which together can form a zygote that can mature into an embryo.
29
30 Reproduction in plants can also take place by vegetative propagation, an asexual process that results in offspring genetically identical to the parent.
31 3.3 Structure and Function of Animal Tissues
32 1) Animal cells do not have plastids or cell walls 2) Adult animals are multicellular organisms with specialized tissues and organs 3) Animals are heterotrophic they do not produce their own food
33 4) Animal species are capable of sexual reproduction 5) Animals develop from embryonic stages 6) Most have symmetrical anatomy either radial or bilateral
34 What type of symmetry does this sea star have?
35 Epithelial Tissues Cell shape Description Location squamous cuboidal columnar transitional flat, irregular round shape cube shaped, central nucleus tall, narrow, nucleus toward base tall, narrow, nucleus along cell round, simple but appear stratified simple: lung alveoli, capillaries stratified: skin, mouth, vagina glands, renal tubules simple: digestive tract pseudostratified: respiratory tract urinary bladder
36 Connective Tissues Tissue Cells Fibers Location loose/areolar fibroblasts, few: collagen, around blood macrophages, elastic, reticular vessels; some anchors lymphocytes, epithelia some neutrophils dense, fibrous connective tissue fibroblasts, macrophages, mostly collagen irregular: skin regular: tendons, ligaments
37 Connective Tissues (continued) Tissue Cells Fibers Location cartilage chondrocytes, hyaline: few shark skeleton, chondroblasts collagen fetal bones, fibrocartilage: human ears, large amount of intervertebral collagen discs bone osteoblasts, some: collagen, vertebrate osteocytes, elastic skeletons osteoclasts adipose adipocytes few adipose (fat) blood Red and white none blood blood cells
38 Types of Muscle Tissue Type of Muscle Striations Nuclei Control Location smooth no single, in center involuntary visceral organs skeletal yes many, at periphery voluntary skeletal muscles cardiac yes single, in involuntary heart center
39
40 Bone tissue is part of the skeleton and helps to provide stability and support for internal organs as muscles move and pull on the bones.
41
42 Cartilage is a tissue that provides cushioning at the joints and ends of bone, like in your knees and the tip of your nose. This helps to reduce friction as muscles pull and move bones.
43 Adipose tissue is used for fat storage, and provides cushioning around organs and insulation from extremes of temperature.
44 Nerve tissue, in the brain and spinal cord, carries chemical and electrical impulses between the brain and the limbs and organs, and nerve tissue in the brain sustains mental activity.
45
46 Blood tissue, composed of white and red blood cells in plasma, carries O to cells, delivers 2 nutrients and wastes, regulates body temperature, and plays an important role in wound healing and immunity.
47
48 3.4 Anatomy of Animal Systems, Part 1
49 Those systems that most animals have in common are digestive, respiratory, skeletal, nervous, circulatory, excretory, and immune systems.
50 The digestive system is the central processing plant for ingested food. Food must be found, consumed, and then undergo catabolic processes in the digestive system to release the energy stored in chemical bonds.
51 Protein and carbohydrates begin breakdown in saliva, lipids not until small intestine, with help of bile acids from the gall bladder.
52 Gall Bladder
53 The respiratory system, or gas exchange system, is responsible for bringing in gases from the surroundings, like O, while 2 also expelling gases as waste products, like the CO you exhale. 2 All living things require the ability to exchange gases with their environment.
54 (4) Primary, Secondary, Tertiary bronchi (1) (2) (5) (3) (6) Alveoli
55 The musculoskeletal system, combining muscle systems and endoskeletal systems, is unique to vertebrates, though variations utilizing an exoskeleton, like those found in crabs, also exist.
56 Endo internal Exo external
57 Includes joints, ligaments, cartilage, muscles, and 206 bones that provide protection for internal organs, as well as the structure and stability necessary to walk upright. Bones also store calcium and phosphates, and produce red blood cells Axial Skeleton
58 Appendicular Skeleton
59 Skeletal muscles are voluntary they move upon command by the nervous system. This contrasts with smooth muscle that lines internal organs and cardiac muscle in the heart which are involuntary the muscles move and contract automatically, without you having to think about it.
60 Skeletal muscles are voluntary they move upon command by the nervous system. This contrasts with smooth muscle that lines internal organs and cardiac muscle in the heart, both of which are involuntary the muscles move and contract automatically, without you having to think about it.
61 3.5 Anatomy of Animal Systems, Part 2
62 Those systems that most animals have in common are digestive, respiratory, skeletal, nervous, circulatory, excretory, and immune systems.
63 The nervous system is the command center for an organisms, and provides control over all bodily functions and actions, both voluntary and involuntary. Nerve tissue that transmits all of these commands is composed of cells called neurons.
64
65 synapse Neurons line up in a network in space, where signals are transmitted from one to the other across a small gap in space called a synapse.
66 The nervous system is divided into two systems: The Central Nervous System (brain and spinal cord) The Peripheral Nervous System (sensory and motor nerves throughout the body)
67
68
69 The circulatory system is responsible for transport of nutrients, gases, and wastes to their destinations. The circulatory system also plays an important role in homeostasis and regulation of body temperature and ph.
70
71 The immune system is the body s main defense from foreign substances or invader, such as an allergen, bacteria, or virus. The lymphatic system, including the lymph, lymph nodes, spleen, thymus, and tonsils, is the principal component of the immune system.
72 Lymph nodes function to produce lymphocytes, cells that work to protect the body from foreign invaders. Lymphocytes originate in the bone marrow as stem cells and are collected and distributed from the lymph nodes.
73 There are two types of lymphocytes: B Cells, which emerge from bone marrow mature and produce protective antibodies (antibody-mediated immune response) T Cells, which mature in the thymus and can directly destroy foreign invaders (cell-mediated immune response)
74 Electron micrograph of a T cell
75 3.6 Homeostasis, Hormones, and Reproduction
76 Life is only possible with in a narrow range of conditions (ph, temperature, water balance, glucose levels) specific to each organism. Feedback control, which can be negative or positive, is the primary method by which homeostasis is maintained.
77 Negative Feedback Response
78 Positive Feedback Response
79 Chemical messengers called hormones play a large role in maintaining homeostasis by generating a response to an internal or external stimulus. This can take place by two different pathways.
80 Mobile Receptor Mechanism Hormone-receptor complex
81 x Membrane Receptor Mechanism Cell membrane receptor
82 Reproduction in multicellular organisms proceeds through the processes of gametogenesis (formation of gametes) and fertilization.
83 Gametes are sex cells formed in the reproductive organs sperm in males, and eggs in females. A zygote results from the fertilization of an egg by a sperm cell.
84 Spermatogenesis Primary spermatocyte
85 Oogenesis
86 3.7 Principles of Genetics
87 Inheritance is the process by which characteristics pass from one generation to the next. The concept of genetic inheritance was advanced through the work of Gregor Mendel, an Augustinian friar.
88 P generation F 1 generation F 2 generation
89 1) Parents transmit hereditary factors (genes) to their offspring 2) Each individual has 2 copies of a gene, which may be different from each other 3) The 2 genes act independently, and one may mask the effect of the other
90 A gene that masks the effect of another is referred to as dominant A gene that can have its effect masked by another is referred to as recessive
91 It is now known that chromosomes carry genetic information, and that the same gene may have different forms, or alleles. For examples, in Mendel s experiments, the gene for flower color had two different alleles one that coded for purple blooms, and one for white blooms.
92 Sometimes a trait can arise from more than one gene; in that case, there will be several possibilities for traits. The combination of alleles that make a specific trait is the genotype. The expressed trait is the phenotype.
93 A Punnett square is a method used to predict the phenotype of simple genetic crosses. A letter is assigned to each gene capital letters are dominant traits and lower case is recessive. Knowing the genotype of both parents, we can predict the genotype and phenotype of the offspring.
94 Monohybrid Cross two individuals, only 1 trait
95 When alleles for a gene are the same in an individual (YY, or yy on the previous slide) the individual is homozygous for that trait. When alleles for a gene are different in an individual (Yy on the previous slide) the individual is heterozygous for that trait.
96
97 3.8 Modern Genetics and Inheritance
98 Inheritance is the process by which characteristics pass from one generation to the next.
99
100 1) The Law of Segregation Traits are expressed from a pair of genes on homologous chromosomes. Each parent provides one chromosome from every pair of homologs, which randomly recombine during gamete formation.
101 2) The Law of Dominance One gene is usually dominant over the other gene.
102 3) The Law of Independent Assortment In Mendel s dihybrid cross, he looked at both seed coat color and texture, and found that most traits were independent of one another.
103 Dihybrid cross two individuals, two traits
104 Incomplete Dominance Traits exist that have no genes that are dominant, and the resulting offspring have a phenotype that is a mix of that of both parents. This occurs in the cross of white and red snapdragons.
105 Linkage and Inheritance While the Law of Independent Assortment held true for pea plants, the same was not found to be true for fruit flies. It was found that some traits were inherited together, or linked.
106
107 Linked traits can be sexlinked males (XY) will express the trait more often, as they only have 1 copy of X, while females have 2, and the other X may be dominant to the trait. Sex-influenced traits only require one recessive gene to be expressed, so long as there is no dominant gene to mask it.
108 Polygenic traits are those that arise from the expression of multiple sets of genes, and, as a result, are difficult to map or predict. Example traits are height and skin color in humans.
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