How many different gamete combinations can be produced

Lab 7 Mendelian Genetics BIO101L

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Pre-Lab Questions

1. In a species of mice, brown fur color is dominant to white fur color. When a brown mouse is crossed with a white mouse all of their offspring have brown fur. Why did none of the offspring have white fur?

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2. Can a person’s genotype be determined by their phenotype? Why or why not?

3. Are incomplete dominant and co-dominant patterns of inheritance found in human traits? If yes, give examples of each.

4. Consider the following genotype: Yy Ss Hh. We have now added the gene for height: Tall (H) or Short (h).

a. How many different gamete combinations can be produced?

b. Many traits (phenotypes), like eye color, are controlled by multiple genes. If eye color were controlled by the number of genes indicated below, how many possible genotype combinations would there be in the following scenarios?

5 Eye Color Genes:

10 Eye Color Genes:

20 Eye Color Genes:

Experiment 1: Punnett Square Crosses

Procedure:

Part 1: Punnett Squares

1. Set up and complete Punnett squares for each of the following crosses: (remember Y = yellow, and y = blue). Please use the following example of a Bb and Bb cross as a guide for filling in your Punnett Squares:

Bb/Bb

B b
B BB Bb
b Bb bb
Cross #1:

YY/Yy

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Cross #2:

YY/yy

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a. What are the resulting phenotypes?

Cross #1: Cross #2:

b. Are there any blue kernels? How can you tell?

2. Set up and complete a Punnett squares for a cross of two of the F1 from Cross #2 (above).

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a. What are the genotypes of the F2 generation?

b. What are their phenotypes?

c. Are there more or less blue kernels than in the F1 generation?

3. Identify the four possible gametes produced by the following individuals:

Individual

YY Ss

Yy Ss

Gamete #1

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Gamete #2

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Gamete #3

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Gamete #4

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a. List the genotypes of the F1 generation that result from a cross of these two individuals.

b. What are the phenotypes of the F1 generation? What is the ratio of those phenotypes?

Part 2: Monohybrid Cross

Table 1: Parent Genotypes: Monohybrid Crosses

Generation

Genotype of Individual #1

Genotype of Individual #2

P

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P1

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P2

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P3

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P4

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Table 2: Generations Data Produced by Monohybrid Crosses

Parents

Possible Offspring Genotypes

Possible Offspring Phenotypes

P

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P1

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P2

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P3

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P4

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Post-Lab Questions

1. How much genotypic variation do you find in the randomly picked parents of your crosses?

Homozygous Dominant:

Heterozygous:

Homozygous Recessive:

2. How much genotypic variation do you find in the offspring?

Homozygous Dominant:

Heterozygous:

Homozygous Recessive:

3. How much phenotypic variation do you find in the randomly picked parents of your crosses?