Yesterday s Picture UNIT 4D
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1 Warm-Up Flies without red pigment have a mutation in the white gene (w -- ); flies with the red pigment are considered wild-type (w + ). Explain how the allele frequency should change over the course of five generations of a population with an equal distribution of red- and white-eyed flies, if w + allele has a selective advantage.
2 Yesterday s Picture
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4 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. Romeo! Juliet!
5 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated.
6 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. (2) Pre-zygotically isolated (cannot/will not mate) Eww bald! Eww feathers!
7 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. (2) Pre-zygotically isolated (cannot/will not mate) ay caramba!
8 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. (2) Pre-zygotically isolated (cannot/will not mate) (3) Post-zygotically isolated (offspring dead or sterile)
9 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. (2) Pre-zygotically isolated (cannot/will not mate) (3) Post-zygotically isolated (offspring dead or sterile) Chromosomes don t match up!
10 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. Speciation can happen quickly (like in plants) Generation 1 (2) Pre-zygotically isolated (cannot/will not mate) (3) Post-zygotically isolated (offspring dead or sterile) Whole-genome duplication No genetic change Generation 2 Chromosomes don t match up!
11 Speciation occurs when two groups become reproductively isolated from each other. (1) Physically isolated. (2) Pre-zygotically isolated (cannot/will not mate) (3) Post-zygotically isolated (offspring dead or sterile) Let s start eating fruits more! Speciation can happen quickly (like in plants) or slowly (like when groups find a new environment). Let s start eating fish more! Fleenitians
12 Speciation and Extinction Extinction is the elimination of a species caused by destabilization of an ecosystem. Fleenzauts Fleenzarks
13 Extinction is the elimination of a species caused by destabilization of an ecosystem. Evolution of whales and dolphins
14 Extinction is the elimination of a species caused by destabilization of an ecosystem. There have been five major mass extinctions caused by massive climate change.
15 Extinction is the elimination of a species There have been five major mass extinctions caused by massive climate change. caused by destabilization of an ecosystem. Scientists have declared Earth is currently experiencing a sixth mass extinction. Extinctions have occurred at over 1,000 times the backgroun d extinction rate since 1900.* *Malcom et al, 2015 Figure: Ceballos et al, 2015
16 CTQ #1 A population of tree monkeys is only found in a remote forest of Ecuador. In 2005, a drought led to massive forest fires, greatly diminishing the tree monkey population. Describe how speciation could occur in the tree monkey population in the context of genetic drift following the forest fire. (LO 1.24) (LO 2.28)
17 CTQ # Million years ago (Ma), most marine and terrestrial species became extinct in what is known as the Triassic- Jurassic era extinction event. Other species, such as crocodylomorphs, were greatly reduced in population size and genetic variation. Explain how the aftermath of this extinction event might have led to new speciation events. (LO 1.20)
18 Closure State three situations in which a population could separate into two species.
Unfortunately, there are many definitions Biological Species: species defined by Morphological Species (Morphospecies): characterizes species by
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