A gene that has been favored by natural selection

In humans, both sexes have the same number of autosomes but different ratios of sex chromosomes. Males are XY, and females are XX. Which statement comparing the X and Y chromosomes is true?

A valid assignment requires that notice be given by the assignee to the obligor.

Analogous features are problematic when constructing evolutionary trees because they:

In humans, both sexes have the same number of autosomes but different ratios of sex chromosomes. Males are XY, and females are XX. Which statement comparing the X and Y chromosomes is true?

A population of organisms that breaks away and becomes different from the original population through isolation and separate evolution might eventually become a separate:

________________ harms companies that are official sponsors by weakening their relationship with the event because, although they have paid large amounts of money to become official sponsors, other companies try to associate with the event for free.   

A valid assignment requires that notice be given by the assignee to the obligor.

An incidental 3rd party beneficiary has no right to enforce a contract to gain a remedy.

What is this figure illustrating?