Solving Genetics Problems: Blood Genotypes and Hemophilia Trait

Problems to solve

Problems to solve

1.What are the probabilities of blood genotypes and phenotypes for the offspring from a cross between a mother with IAIA blood and a father with IBi blood?

2. Hemophiliacs have blood that does not coagulate well, and they often die at a young age. The disease allele is recessive and X-linked. The normal allele (N) is completely dominant over the disease allele (n). If a hemophiliac woman and a non-hemophiliac (normal) man have children, what percentage of their sons would be expected to have the disease? What percentage of their daughters would be expected to have the disease?

3. If a woman who is heterozygous for the hemophilia trait and a hemophiliac man have children, what percentage of their sons would be expected to have the disease? What percentage of their daughters would be expected to have the disease?

How to submit your answers for credit and see the key

You have a lot of flexibility in how you submit your work. As long as you include your completed Punnett squares to show how you arrived at your answers, and provide the answers to the questions, including probabilities of both genotypes and phenotypes, clearly labeled which is which, you will get credit. Use the examples in Lessons 9B and 9C as your guide.

You are being graded on completion rather than the correctness of your answers. Thus, even if you get some things wrong, you can still get full credit. They key is that you show all of your work and provide everything that is asked for in the question.

You can view the grading rubric for this assignment by accessing Rubrics from the Assessments drop-down menu, or by clicking on the link within the Assignment 9 Dropbox directions.

1. What are the probabilities of blood genotypes and phenotypes for the offspring from a cross between a mother with IAIA blood and a father with IBi blood?

2. Hemophiliacs have blood that does not coagulate well, and they often die at a young age. The disease allele is recessive and X-linked. The normal allele (N) is completely dominant over the disease allele (n). If a hemophiliac woman and a non-hemophiliac (normal) man have children, what percentage of their sons would be expected to have the disease? What percentage of their daughters would be expected to have the disease?

3. If a woman who is heterozygous for the hemophilia trait and a hemophiliac man have children, what percentage of their sons would be expected to have the disease? What percentage of their daughters would be expected to have the disease?