Why is speciation by polyploidy more likely in plants than in animals?
A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis.
B) Plant gametes lack postzygotic isolating mechanisms.
C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction.
D) Plants are sessile and cannot speciate via dispersal.
E) Plants lack the DNA repair enzymes that animals have.
Answer: A
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The FDA-approved GM Atlantic salmon have a growth hormone transgene that is expressed year-round, which is advantageous because
A) the salmon is more nutritious. B) the salmon achieve their full weight faster. C) the salmon produce more offspring. D) the salmon are more resistant to infection.
Assume that there are 12 map units between two loci in the mouse and that you are able to microscopically observe meiotic chromosomes in this organism
If you examined 200 primary oocytes, in how many would you expect to see a chiasma between the two loci?
According to the theory of common descent, how should each species on Earth today compare?
A) They should look very similar to all other species. B) They should not have ancestors in common with members of other species. C) They should have a single ancestor in common. D) They should have DNA that is mostly unique from other species.
Which of the following has eggs that do not require a moist environment to complete development?
a. Salamander b. Frog c. Toad d. Cecilia e. None of the listed responses are correct.