Chromosomes in other species

Question 1

T/F. Among primates, the X chromosome is remarkably constant in size and banding pattern.

Answer 1

True.

Question 2

T/F. Other chromosomes are more variable and the variation in chromosome number and appearance is in proportion to the timing of evolutionary separation of the species

Answer 2

True

Question 3

The gorilla, chimpanzee and orang-utan have 48 chromosomes, and the autosomes are similar to those in humans, with the exception of human chromosome _____, which appears to have been derived from two ape acrocentrics after separation of the species.

Answer 3

2

Question 4

T/F. Interestingly, the fragile site on human chromosome 2 seems to mark the site of this ancient fusion.

Answer 4

True

Question 5

T/F. Large chromosomal segments are conserved even between non-primate mammals and humans.

Answer 5

True

Question 6

_____ studies using chromosome-specific fluorescent DNA probes have been particularly useful in analysing patterns of chromosome homology.

Answer 6

Cross-species chromosome painting

Question 6

Interestingly, analyses of homologous ____ blocks between mammalian species indicate that, in independent mammalian evolutionary lineages, inter-chromosomal rearrangements have often occurred at apparently identical _____. Moreover, these regions tend to be ____.

Answer 6

Synteny; chromosomal breakpoint; gene-rich