Exam 14: Mendel and the Gene

A man is heterozygous for two genes R and L) that are located on different chromosomes. Which of the following processes would result in different combinations of the alleles for these two genes in his sperm?

The second child of the couple above is unaffected does not display the condition). What is the probability this child is a carrier for the ataxia condition?

Julie has Harman's ataxia hh) and also has achrondoplasia Aa). Josh is a carrier for Harman's ataxia, an autosomal recessive disorder, and has achondroplasia Aa), which is an autosomal dominant trait. AA human embryos do not survive beyond the first few cell divisions. What is the probability that a child born to them would have only Harman's ataxia? Assume the genes are unlinked.

What is the likelihood that the progeny of IV- 3 and IV- 4 will have the trait?

A recessive allele on the X chromosome is responsible for red- green colour blindness in humans. A woman with normal vision whose father is colour blind marries a colour- blind male. What is the probability that this couple's first son will be colour blind?

Mendel crossed yellow- seeded and green- seeded pea plants and then allowed the offspring to self- pollinate to produce an F₂ generation. The results were as follows: 6022 yellow and 2001 green 8023 total). The allele for green seeds has what relationship to the allele for yellow seeds?

In humans, blue eyes are inherited as a recessive autosomal trait and colour blindness is an X- linked recessive trait. A woman with blue eyes and normal colour vision whose father was colour blind marries a man who also has normal colour vision. He has brown eyes but his mother had blue eyes. Which of the following do you expect to be true for their daughters?