Exam 12: The Chromosomal Basis of Inheritance and DNA: The Genetic Material

At an autosomal gene locus in humans, the allele for brown eyes is dominant over the allele for blue eyes. At another gene locus, located on the X chromosome, a recessive allele produces colorblindness while the dominant allele produces normal color vision. A heterozygous brown-eyed woman who is a carrier of colorblindness marries a blue-eyed man who is not colorblind. The woman becomes pregnant and an ultrasound test shows that the child is a girl. What is the probability that she will be colorblind? (Enter the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5)

You are performing an experiment to study replication of DNA on a specific yeast chromosome. Yeast cells were synchronized in G1 and were released into S phase. DNA was recovered every five minutes after release into S phase, and an analysis was done to look for DNA replication in specific regions of the yeast chromosome. Assume that these regions of the yeast chromosome are adjacent to each other in the following order: Region A, Region B, Region C, Region D. The data below indicate the times during which DNA replication was observed in each of these regions. Using these data, which region or regions of the yeast chromosome most likely contained an origin of replication? Times When DNA Replication Was Observed in Each Region: Region A: 40 minutes, 45 minutes, and 50 minutes Region B: 35 minutes, 40 minutes and 45 minutes Region C: 30 minutes, 35 minutes, and 40 minutes Region D: 35 minutes, 40 minutes, and 45 minutes

Assuming no chromosomal aneuploidies, a calico cat would be which gender?

In some species, sex determination is influenced by environmental temperature during development. If you wanted to determine the temperature at which one would obtain a 1:1 sex ratio in a particular species of turtle, which of the following experiments would best address this question?

What is the relationship between recombination frequency and the actual physical distance on a chromosome?