SCI-LS Genetics_khetrick Exam not valid for Paper Pencil Test Sessions

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1 SCI-LS Genetics_khetrick Exam not valid for Paper Pencil Test Sessions [Exam ID:78GZGM 1 The diagram above shows a picture of the DNA molecule. The DNA molecule can be described as A being flat like a sheet of paper B having a double helix shape C rod-shaped D a single strand with two nitrogenous bases 2 In Deoxyribonucleic acid, cytosine pairs with the nitrogen base A guanine B thymine C adenine D uracil 3 The hereditary material that controls all cellular activities is called A cytoplasm B chloroplast C ATP D DNA

2 4 DNA is essential to living organisms because it A can break apart B can prevent diseases C carries the genetic code D is a spiral helix 5 Which of the following pictures BEST represents a molecule of DNA? A B C D 6 What part of the DNA molecule forms a chemical (genetic) code? A Nitrogen bases B Sugars C Oxygen D Phosphates

3 7 Where is DNA located in the cell? A Vacuole B Cytoplasm C Mitochondria D Nucleus 8 Directions: Click on the text you want to select. Be sure to select all of the correct answers. What are the main components of DNA? Salts Nitrogenous bases Phosphates Oxides Carbon bases Sugars 9 What is the correct abbreviation for deoxyribonucleic acid? A RNA B DNA C DRA D DOA

4 10 The above figure contains examples of A phenotypes B the law of Mendelian genetics C chromosomes D Punnett squares 11 Which section of the shown figure carries the code for a particular trait in an organism? A Section W B Section X C Section Z D Section Y

5 12 What is the chromosome labeled in the above figure? A Section Y B Section X C Section Z D Section W 13 How many chromosomes are normally found in a human sex cell? A 48 B 46 C 23 D Chromosomes are composed of coiled together A phosphate B cytoplasm C chromatin D nitrogen 15 Mendel proposed that traits observed in pea plants resulted from a combination of factors inherited from each parent. His description of these factors can be considered the first scientific definition of the role of A meiosis B cell nuclei C ribosomes D genes 16 How many chromosomes does a human body cell have?

6 17 Different versions or forms of the same gene are called A chromosomes B sex cells C alleles D nitrogen bases 18 Which of the following statements is true? A Chromosomes absorb sunlight and help plants go through photosynthesis. B Men usually have more chromosomes than women. C Human body cells have 46 chromosomes. D Dogs and humans have the same number of chromosomes. 19 In guinea pigs, brown fur (B) is dominant over white fur (b). Design a Punnett square to demonstrate the possible outcome if a purebred brown guinea pig is crossed with a purebred white guinea pig. What percentage of the offspring will have white fur? A 0% B 50% C 25% D 100% 20 In the Punnett square, Black fur (B ) is dominant over brown fur (b ). What is the phenotype of all four offspring? A Brown fur B Black fur C White fur D Mix between black and brown 21 What traits could represent the phenotype of an organism? A wrinkled, ww B yellow, tall C Rr, RR D Tt, purple

7 22 If free ear lobes ( L ) are dominant over attached ear lobes ( l ) what is the phenotype of an individual with a genotype of l l? A Attached ear lobes B One ear lobe attached, one ear lobe free C Free ear lobes D L L 23 In a genotype, what does the lower case letter represent? A The recessive trait B The dominant trait C Multiple dominance D Incomplete dominance 24 What is an organism called that has two different genes for a trait? (examples: Tt or Rr) A A mutation B An endangered species C A hybrid D A purebred 25 When Mendel worked with pea plants, he noticed that some traits, like round seeds, seemed to hide other traits, like wrinkled seeds. What do we call the trait that hides or masks another trait? A Incomplete dominance B DNA replication C A recessive trait D A dominant trait 26 If the tall trait is dominant over the short trait, which would be used to represent the dominant trait? A T B S C t D s

8 27 What could represent the genotypes of an organism? A Tt, green B Rr, TT C Tall, red D Wrinkled, gy 28 Directions: Type your answer in the blank. In humans, brown eyes (B) are dominant over blue eyes (b). A brown-eyed man marries a brown-eyed woman and they have three children. Two of these children have brown eyes and one has blue eyes. What is genotype of both the man and the woman? Genotype 29 This is a "drag and drop" question. Drag the items on the right to their correct position in the diagram. A gardener crossed two pea plants. She took the pollen from one plant that produced round seeds and placed it on the stigma of another plant that produced wrinkled seeds. If 50% of the offspring of these two plants produced round seeds and the other 50% produced wrinkled seeds, what are the genotypes of the gardener's "parent" plants? rr Rr RR 30 Click on each answer you want to select. You must select all correct answers. Choose all the genotypes that are heterozygous. Dd tt Bb HH AA Mm

9 31 Click on each answer you want to select. You must select all correct answers. Choose all of the genotypes that are homozygous dominant. aa Tt AA TT bb Bb 32 Click on each answer you want to select. You must select all correct answers. In gerbils, black fur is recessive to brown ("agouti pattern") fur. Choose the possible genotype(s) for a brown "agouti pattern" gerbil. BB Bb bb 33 In guinea pigs, brown fur (B) is dominant over white fur (b). Design a Punnett square to demonstrate the possible outcome if a purebred brown guinea pig is crossed with a purebred white guinea pig. What genotype would be possible? A BB B white fur C bb D Bb 34 Directions: Click on each answer that you would like to select. Be sure to select all of the correct answers. A man with brown eyes reproduces with a woman that also has brown eyes. What are the possible genotypes for their child? Bb BB Be bb be

10 35 According to the Punnett square, all four offspring are hybrids. This means that both parents must be A dominant B hybrids C purebreds D codominant 36 Of the traits listed in the chart, which are inherited traits? A A, D, F, and G B A, D, E, and H C A, B, C, and F D B, C, E, and H 37 What would NOT represent an inherited trait for a plant? A How tall it grows B The color of its flowers C If it receives enough rain D The type of fruit it produces 38 This is a "hot spot" question. Choose all the answers that apply. Which of the following characteristics are controlled by a person's genes? How many fingers they have How long their eyelashes are How many friends they have How many freckles they have How funny their jokes are

11 39 Directions: Click on each answer you wish to select. You must select all of the correct answers. Which of the following characteristics are most likely inherited traits? Dyed hair Hairline shape Thick hair Long eyelashes Bangs Joined eyebrows Short hair Baldness 40 Which of these is due entirely to inheritance in humans? A Endurance B Eye color C Reading skill D Broken bones 41 A change or mistake in the DNA can cause A blending B a mutation C meiosis D incomplete dominance 42 Which would NOT represent an inherited trait? A Popping your knuckles B Dimples C Curly hair D Blue eyes 43 Which sex chromosome combination is for a female? A XY B XYY C XX D YY 44 The Thompson family has four daughters. What is the probability their next child will also be a girl? A 0% B 25% C 100% D 50%