Genetics Practice Problems

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# Genetics Practice Problems - PowerPoint PPT Presentation

Genetics Practice Problems. Ratios. 1. What would be the genotypic and phenotypic ratios be for a cross between a true-breeding tall pea plant and a true-breeding short pea plant?. 2. What would be the phenotypic ratio be for the following cross: Tt x tt.

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### Ratios

1. What would be the genotypic and phenotypic ratios be for a cross between a true-breeding tall pea plant and a true-breeding short pea plant?

7. In cows, roan coat color is caused by having one red allele (R) and one white allele (W). What is the genotypic ratio of the following cross:RR x WW

9. In snapdragons, red flower color (R) is incompletely dominant to white flower color (R’), what is the phenotypic and genotypic ratio for the following cross:RR x R’R’

11. In Guinea Pigs, 2 genes control coat color. One gene controls whether they will be colored (A) or albino (a). The other gene determines if they will be black (B) or brown (b). What type of inheritance pattern is this?

AaBB x Aabb

AaBb x AaBb

AaBB x aaBb

AaBb x aabb

### Probabilities

Calculate the probabilities of the production of the offspring for each cross

AaBB

AAbbCc

AABBCC

AaBbCc

aabbcc

### How many gametes are produced during oogenesis?

What is the scientific name for the gamete?

### Gene Mapping

b+bvg+vg x bbvgvg
• Wild Type: 750
• Double Mutant: 764
• Black – Normal: 120
• Grey – Vestigial: 166
• What is the recombination frequency?