Question

please tell me if the following two things are true or false:

A) a yeast colony shows a relatively small sector with a different phenotype, it is possible that mitotic recombination occurred late in the colony's growth.

B)Twin spots are not observed in yeast sectors because one of the "spots" is indistinguishable from adjacent nonrecombinant cell

Answer 1

A. The statement is True

Explanation

The size of sectors indicates when mitotic recombination took place. If they are large, it happened early in the growth of the colony giving the resulting daughter cells a long time to proliferate. If they are small, the recombination happened later.

B. The statement is False.

Explanation

Twin spots are adjacent islands of tissue that differ both from each other and from the tissue surrounding them. The distinctive patches arise from homozygous cells with a recessive phenotype growing amide a generally heterozygous cell population displaying the dominant phenotype.