Hunter syndrome is a rare form of mucopolysacchararidosis that differs from all other forms in that it shows X-linked recessive inheritance. A woman with two affected brothers is referred for genetic counselling. Which of the following is correct?

#Question id: 4611

#Unit 9. Evolution & Diversity of Life Forms

Given what we know about evolutionary biology, we expect to find the largest number of endemic species in which of the following geological features, which have existed for at least a few million years?

#Question id: 4612

#Unit 9. Evolution & Diversity of Life Forms

The greatest number of endemic species is expected in environments that are ________.

#Question id: 4613

#Unit 9. Evolution & Diversity of Life Forms

The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change.  Which species is most closely related to species W?

#Question id: 4614

#Unit 9. Evolution & Diversity of Life Forms

Which of these is the extant (that is, living) species most closely related to species X?

#Question id: 4615

#Unit 9. Evolution & Diversity of Life Forms

Currently, two of the living elephant species (X and Y) are placed in the genus Loxodonta, and a third surviving species (Z) is placed in the genus Elephas. Assuming this classification reflects evolutionary relatedness, which of the following is the most accurate phylogenetic tree?

#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?