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Three alleles were observed at an autosomal locus. Find the frequency of each allele when A1 and A2 are codominant, and are both dominant to A3. Genotype Frequency A1A1: 134

A2A2: 123

A3A3: 12

A1A2: 45

A1A3: 43

A2A3: 65

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Jamar Ferry
Jamar FerryLv2
28 Sep 2019

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Related questions

Consider a single locus with three alleles: A1, A2, and A3.

1) Write down all of the diploid genotypes possible at this locus.

2) Derive the equation for the frequency of allele A1 as a function of the genotype frequencies.

Consider the following two datasets:

At the M locus:

In a study of 1000 adults, the following genotype numbers were found:

M1M1 - 213 individuals

M1M2 - 489 individuals

M2M2 - 298 individuals

At the S locus:

In a study of 4555 adults, the following genotype numbers were found:

S1S1 - 3564 individuals

S1S2 - 979 individuals

S2S2 - 12 individuals

Assignment: For both loci

Calculate the frequency of the alleles.

Calculate expected number of each genotype if the population were in Hardy-Weinberg equilibrium.

Identify which locus most clearly violates at least one of the H-W assumptions

GENETICS : You perform a dihybrid cross between two dogs that are each BbFf. Where not specified otherwise, assume black fur B is completely dominant to white fur b and furry F is completely dominant to hairless f

1. What genotypes at one locus will be epistatic to what genotypes at the other locus, if hair color and hair presence were the only measured phenotypes? (you may find it helpful to write out the genotypes and the phenotypes each would produce, and remember that epistasis is involved in this question).

What phenotypic ratios would you expect in the following scenarios (assume, unless otherwise noted, that the epistasis in part 1 still applies)?

2. Black B is completely dominant to albino b, furry F is completely dominant to hairless f

3. Black displays incomplete dominance to albino , and furry is codominant with hairless

4. Animals that are heterozygous at either locus are black and furry, overriding the other locus' geneotype

5. The black allele B displays epistasis when present at even one copy that masks the effects of the hairless f allele

6. It takes two black B alleles to mask the effects of the hairless f allele

7. Both the black alleles B and furry alleles F are lethal in their homozygous dominant states

8. Both the albino alleles b and hairless alleles f are lethal in their homozygous recessive states

9. Female dogs die when they have homozygous recessive or homozygous dominant states for either locus (dogs use XY inheritance for sex like we do). Note sex of doss in your phenotype ratios.

10. The black allele B although completely dominant, is the only 70% penetrant in heterozygotes and is 90% penetrant in homozygotes for the B allele

11. The hairless allele f is dominant in males and recessive in females

Question 2 (5 pts). In roses, two gene loci on an autosomal chromosome are 30cM from each other. At locus 1, the E allele for red flower color is completely dominant to the e allele for pink flower color. At locus 2, the G allele for thorns is completely dominant to allele g for thornless. A particular rose cultivar, true-breeding for red flower and thorns, is crossed to cultivar 2, true-breeding for pink flowers and thornless. The F1 generation is testcrossed with cultivar 2 and 300 testcross progeny are produced.

What is the expected frequency of gametes of genotype EG produced by the F1-generations plants?

When the F1-generation plants produce gametes, what is the expected frequency of recombinant gametes?

In the testcross progeny, how many plants are expected to have pink flowers and be thornless?

In the testcross progeny, how many plants are expected to have pink flowers and thorns?

e. If the two loci were not linked, and segregated independently from each other, how

many plants would be expected to have pink flowers and thorns in the testcross progeny?

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