Step-by-Step Solution
The pedigree showing the inheritance, for protan color blindness and deutan color blindness is shown. The vertical lines in the pedigree indicate protan color blindness and the horizontal lines indicate deutan color blindness.
Therefore, blindness is determined by separate genes.
a) By observing the pedigree, we note that only males are affected. This indicates that both the diseases are X-linked recessive disorders.
Yes, the pedigree shows linkage. The individual III-2 shows proof that both the genes are linked.
b) Yes, the pedigree shows evidence of crossing over. The individual III-2 has inherited both the defective chromosomes in the trans configuration on separate chromosomes.
Hence, the individual III-2 has inherited both the traits as a result of recombination between his mother’s two X chromosomes.
The pedigree proving the answers to the above subparts is:
c) Since, both the genes are X-linked; it indicates that independent assortment has not occurred. The size of the progeny is too small to calculate the recombination between these two genes.
Hence, this recombination is due to crossing over.
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