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Inheritance Problems - Online Essay

Inheritance Problems

Inheritance Problems (M3)

1. Phenylketonuria (PKU) is a genetic disease that can lead to poor development of brain. The allele for PKU is recessive to the allele for no PKU. A woman has found she is heterozygous for PKU. Her male partner is homozygous for the normal allele. You need to explain, (using genetic diagrams for a and b):

a. Why the woman does not suffer from the condition.

If neither of a PKU child's parents have the disorder themselves, they are carriers of the gene, or heterozygous for the condition. Heterozygous is the biological term for a person that has one dominant gene for a trait and one recessive gene. In individuals that are heterozygous for PKU, the ...

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with the disease.

no

c. What percentage of their children are likely to be carriers?

6. 1. Carrier Mother + Non-hemophiliac Father When a carrier Mother and an unaffected Father create a child, each pregnancy has a 25% chance of resulting in a female noncarrier, a 25% chance of a female carrier, a 25% chance of non-hemophiliac male, and a 25% chance of a male with hemophilia.

2. If parents are aware of a genetic disease within a family, the examination of a family tree, sometimes called a pedigree diagram, A couple with a family history of sickle cell disease have sent you a pedigree diagram (shown below). The concerned couple are numbers 7 and 8 on the diagram.

Look at the family tree and using suitable symbols suggest what the genotype of individual 6 might be.

b. lf individuals 7 and 8 have children, what proportion of the children would be expected to be carriers of the disease?

3. Huntington`s disease (HD) causes cells in the brain to degenerate. A person ...

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PAPER DETAILS

Added: 6/1/2016 12:28:06 PM
Submitted By: mshelani
Category: Health & Medicine
Type: Free Paper
Words: 1051
Pages: 4

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