# GENETICS LABORATORY EXERCISE 1. Practice with pedigree charts. A man and his maternal grandfather have a...

GENETICS LABORATORY EXERCISE 1. Practice with pedigree charts. A man and his maternal grandfather have a particular condition. This man married a woman and had four children in the following order: boy, boy, girl, boy. All the children of this marriage except the oldest boy had the condition. The woman of this marriage had a paternal grandfather that had the condition. Only the above individuals have the condition a. Draw a pedigree showing the above information. Use appropriate pedigree symbols. b. Is the condition dominant or recessive? c. Write genotypes for all individuals you can in the pedigree d. What is the probability that the oldest son of the last generation will have a child with the condition if he marries a woman: (1) with the condition (2) who does not have the condition, but is a carrier of the condition (3) without the condition and who is not a carrier of the condition Note: You will need to construct 3 different Punnett squares. You may have to take a picture of this page and upload separately. 2. Assume that you are studying an organism with 3 genes having the alleles A and a, B and b, and C and c respectively. To the right of each genotype list the types of gametes that would be produced by that individual. a. AABBCC b. AaBBce c. AaBBCc d. АавьСе

2).

a). AABBCC genotype produces only one type of gametes, ABC

b). AaBBcc genotype produces two types of gametes ABc and aBc in equal proportion (1/2).

c). AaBBCc genotype produces four types of gametes, ABC, ABc, aBC & aBc in equal proportion (1/4).

d). AaBbCc genotype produces 8types of gametes.

ABC =1/8

ABc = 1/8

AbC =1/8

Abc = 1/8

aBC = 1/8

aBc = 1/8

abC = 1/8

abc = 1/8

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