A wild-type fruit fly heterozygous for gray body color and normal wings was mated with a black fly with vestigial wings to produced 1000 offspring. Recombination frequency between these genes for body color and wing type is 20 %. What number of offspring that is gray body colour and normal wing?

#Question id: 4616

#Unit 9. Evolution & Diversity of Life Forms

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?

#Question id: 4617

#Unit 9. Evolution & Diversity of Life Forms

Which of the following is not an observation or inference on which natural selection is based?

#Question id: 4618

#Unit 9. Evolution & Diversity of Life Forms

Which of the following observations helped Darwin shape his concept of descent with modification?

#Question id: 4619

#Unit 9. Evolution & Diversity of Life Forms

Within six months of effectively using methicillin to treat S. aureus infections in a community, all new S.aureus infections were caused by MRSA. How can this best be explained?

#Question id: 4620

#Unit 9. Evolution & Diversity of Life Forms

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

#Question id: 4621

#Unit 9. Evolution & Diversity of Life Forms

DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that