Genetics practice problems
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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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Genetics Practice Problems

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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 R’R’


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 2nd 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


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