The frequency of sister chromatid exchanges is increased by A.Colchicine B. Exce

Question

The frequency of sister chromatid exchanges is increased by

A.Colchicine

B. Excessive tandem repeat region

C.Colicins

D. DNA Damage

E. None of the above affects the rate of sister chromatid infection

An "AA" individual is crossed with an individual with an "aa" genotype. The F2 offspring include 85% of the "A" phenotype and 15% of the "a" phenotype. With respect to the "a" phenotype, this could be a good example of

A. Incomplete Dominance

B. Codominance

C. Simple dominant/recessive alleles

D. Epistatis

E. Partial Penetrance

Explanation / Answer

Ans is DNA damage.

The sister chromatid exchange (SCE) measure distinguishes the capacity of a substance to improve the trading of DNA between two sister chromatids of a copying chromosome. The test might be performed in vitro, utilizing consistent cell lines, or in vivo utilizing creature models, for example, mice, rats, and hamsters. For in vitro measures, cell societies are presented to test chemicals, and permitted to reproduce within the sight of bromodeoxyuridine. The cells are then treated with colchicine or colcemid to capture cells in a metaphase-like phase of mitosis, and following gathering chromosome arrangements made. Arrangements are recolored and metaphase cells broke down for SCEs utilizing a magnifying lens.

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