Reference no: EM133544637

Question: A man and woman marry and have 3 children. When the man is 50 years old, he is diagnosed with Huntington's disease (which is inherited dominantly). The woman is tested and she does not carry the gene. 

What is the chance for each child to have Huntington's disease?

Are the 3 events (the children having HD) independent or mutually exclusive?

What are the chances that all three children are HD free?

If one of the three children marries a person with no family history of HD (assume normal), what is the chance that their child will have the disease? (we do not know yet if the parent has it or not)

- You are studying single gene traits in peas. These are the traits you are following: 

Gene Symbol   Alleles

Y/y                   Yellow pea  is dominant to green

R/r                   Round pea is dominant to wrinkled

P/p                  Purple flower is dominant to white flowers

U/u                  Unripe pods are dominant to ripe pods

You cross pollen from a pea that is of genotype YyRrPpUu with ovules from a pea whose genotype is YYrrPpUU 

1. How many different types of gametes can the female produce? 
2. How many different types of gametes can the male produce? 
3. What fraction of the progeny will be phenotypically identical the female parent? 
4. What fraction of the progeny will be phenotypically identical the male parent? 
5. What fraction of the progeny will be homozygous at all seven loci? 
6. What fraction of the progeny will be heterozygous at all seven loci?