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-

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Presentation transcript:

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

3. What would be the genotypic and phenotypic ratio for the following cross: Tt x Tt

4. What would be the genotypic and phenotypic ratios for the following cross: TTAA x ttaa

5. What would be the phenotypic ratio for the following cross: TtAa x ttaa

6. What would be the genotypic and phenotypic ratios for the following cross: TtAa x TtAa

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

8. What is the phenotypic and genotypic ratio of the following cross: RW x RW

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 RR

10. What are the phenotypic and genotypic ratios of the following cross: RR x RR

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?

12. What will be the phenotypic ratio of the following crosses: 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 x aaBB AaBB

AaBbCc x AaBbCc AAbbCc AABBCC AaBbCc aabbcc

Non-Mendelian Inheritance Patterns

Many genes control the expression of one trait.

One gene has many phenotypic effects.

In a heterozygote, both alleles are expressed individually.

In a heterozygote, the phenotype expressed is blended between what the alleles actually code for.

2 genes affect one trait, but one gene controls the expression of the 2 nd gene.

Spermatogenesis and Oogenesis

How many gametes are produced during oogenesis? What is the scientific name for the gamete?

When does spermatogenesis begin?

How many gametes are produced during spermatogenesis?

When does oogenesis begin?

Gene Mapping

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

Linkage Map A-B = 23 mu A-C = 12 mu B-C = 11 mu

Linkage Map A-B = 10 A-C =5 A-D = 18 B-C = 15 B-D = 8 C-D = 23