An autosomal recessive form of deafness is caused by a mutation in the ESPN gene (E = dominant allele and e = recessive allele). An autosomal recessive disease called Usher syndrome is caused by a mutation in the USH2A gene (H = dominant allele and h = recessive allele). The ESPN and USH2A genes are far apart on chromosome 1. Iris's genotype= eeHH Zacharias' genotype= EEhh Zacharias and Iris have a daughter named Gianna (EeHh) who produces an eh gamete. Here are some pictures of metaphase I cells before recombination has been resolved. Which one of the pictures correctly depicts Gianna's metaphase I cell that could divide to produce her eh gamete? (Hint: it is useful to consider the gametes that Iris and Zacharias each contributed to Gianna)
An autosomal recessive form of deafness is caused by a mutation in the ESPN gene (E = dominant allele and e = recessive allele). An autosomal recessive disease called Usher syndrome is caused by a mutation in the USH2A gene (H = dominant allele and h = recessive allele). The ESPN and USH2A genes are far apart on chromosome 1.
Iris's genotype= eeHH
Zacharias' genotype= EEhh
Zacharias and Iris have a daughter named Gianna (EeHh) who produces an eh gamete.
Here are some pictures of metaphase I cells before recombination has been resolved. Which one of the pictures correctly depicts Gianna's metaphase I cell that could divide to produce her eh gamete? (Hint: it is useful to consider the gametes that Iris and Zacharias each contributed to Gianna)
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