Humans have a chromosome number of 2n = 46 due to a fusion event that gave rise

Question

Humans have a chromosome number of 2n = 46 due to a fusion event that gave rise to our chromosome 2, unlike our closest living relatives, the chimpanzees, which have a chromosome number of 2n = 48. Pay attention to the words in the question! (a) How many pairs of sister chromatids does a chimpanzee have in its somatic cells? (b) What number of chromosomes would be found in a female chimpanzee's mature gametes? (c) What number of tetrads would there be in a human female's gametic cell during Prophase 1 of Metals 1? (d) What number of chromosomes would there be in a human male's gametic cell during G1 of Interphase? (e) What number of chromosomes would there be in a chimpanzee's somatic cell immediately following meiotic cytokinesis? On this illustration of chromosome 21, clearly label the centromere, kinetochores and heterochromatin. Place a smiley face in the position of q-ter. Does this represent a chromosome during the S phase of Interphase or a chromosome in Prophase of Mitosis?

Explanation / Answer

2.

A. 48 pairs of sister chromatids.

B. 24 chromosomes will be found in mature gamete of female chimpanzee.

C. 23 tetrad will be found at prophase I of meiosis I in human.females gametic cell.

D. 46 chromosomes will be found in gametic cell at G1 phase.

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