Why was it initially expected that cloned animals might have a shorter life span?
A)The chromosomes of the donor nuclei had shortened telomeres.
B)The chromosomes of the donor nuclei had lengthened telomeres.
C)The egg cell had elevated telomerase.
D)The donor cell had elevated telomerase.
E)After transplant of the nucleus, telomerase levels climbed precipitously.

Question

Quizplus · Accepted Answer

Telomeres are the protective ends of chromosomes that shorten with each cell division, eventually leading to cell death. Since donor cells used in cloning are usually already differentiated and have gone through many cell divisions, their telomeres are already shorter than those in embryonic cells. Thus, clones formed from mature cells were initially expected to have shorter telomeres and a shorter lifespan.

Why Was It Initially Expected That Cloned Animals Might Have