Problem

Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 16P

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Solution 1

Genetic recombination produces alleles of new combinations. They are encoded with genetic information. The process of recombination is mediated by homologous chromosomes in meiosis. For instance, in Neurospora strain having genotype is crossed with a strain of genotype. The resulting progeny is:

• 50% -

• 50% -

In contrast, the progeny contains only parental phenotypes, which indicate that the two genes are very tightly linked. The resulted progeny reveals that there is no recombination has occurred between the genes. Thus, the distance between the genes can be determined by knowing the total number of progeny.

In addition, parental types are recovered, since the two genes are tightly linked and recombination must be very rare. Therefore, the number of progeny observed would give an indication, how close the genes are.

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