The question refers to the following table, which compares the percent sequence homology of four different parts (two introns and two exons) of a gene that is found in five different eukaryotic species. Each part is numbered to indicate its distance from the promoter (for example, Intron I is the one closest to the promoter). The data reported for species A were obtained by comparing DNA from one member of species A to another member of species A.

Which of these four gene parts should allow the construction of the most accurate phylogenetic tree, assuming that this is the only part of the gene that has acted as a reliable molecular clock?

#Question id: 4798

#Unit 8. Inheritance Biology

In goats, a beard is produced by an autosomal allele that is dominant in males and recessive in females. We’ll use the symbol Bb for the beard allele and B for the beardless allele. Another independently assorting autosomal allele that produces a black coat (W) is dominant over the allele for white coat (w). A cross allowed between BBbWw (male) X BBbWw (female). What is proportional of female progeny will beard with black coat?

#Question id: 5596

#Unit 5. Developmental Biology

The functional maturation of sperm after they have been deposited in the female reproductive tract, known as

#Question id: 1391

#Unit 4. Cell Communication and Cell Signaling

If an adult person has a faulty version of the human analog to ced-4 of the nematode, which of the following is most likely to result?

#Question id: 26885

#Unit 10. Ecological Principles

major anthropogenic atmospheric gases causing the greenhouse effect is

#Question id: 1560

#Unit 4. Cell Communication and Cell Signaling

An invertebrate, such as an insect, has innate immunity that can be nonspecific about which pathogens are prevented from harming its metabolism. Which of the following is most likely to function this way in the insectʹs intestine?