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Assignment one: chapter 1: 1, a,c,d,g; 3;5;7;9;13;21; chapter
2:1,3,5,9,15,21,25.
One extra problem: People with albinism have litlle
pigment in their skin, hair, and eyes. The gene that governs
albinism has two forms (alleles), which we denote by A and
a. EAch person has a pair of these genes, one inherited from
each parent. A child inherits one of each parent's two alleles,
independently with probability 0.5. Albinism is a recessive
trait, so a person is albino only if inherited pair is aa.
(a) Beth's parents are not albino but she has an albino
brother. This implies that both of Beth's parents have type
Aa. Why?
(b) Which of the types aa, Aa, AA could a child of Beth's
parents have? What is the probability of each type?
(c) Beth is not albino. What are the conditional
probabilities for Beth's possible genetic types, given this
fact?
(d) From part (c), Beth knows the probabilities for her
genetic type. She marries Bob, who is albino. Beth and Bob's
first child is nonalbino. What is the conditional probability
that Beth is a carrier, type Aa?
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This note was uploaded on 05/18/2010 for the course BIOL 2060 taught by Professor Profgao during the Spring '10 term at York University.
 Spring '10
 profgao

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