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2 years ago

15

In Amazonian giant mice, a fictional species, purple coat color is dominant over yellow coat color. Two mice with the heterozygo

us genotype for coat color are crossed.

1 answer:

zubka84 [21]2 years ago

7 0

The result will most likely be purple

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The kernel color in wheat is a continuous trait determined by two additive genes, each with two alleles, that equally contribute

dedylja [7]

Answer:

Phenotypic ratio: 1:4:6:4:1

Punnett square: Below in the explanation box

Frequency distribution: In the attached files

Explanation:

<u>Available data</u>:

The kernel color in wheat is a continuous trait determined by two additive diallelic genes
The red kernels are determined by two genes and two dominant alleles (R1R1R2R2)
The white kernels are determined by two recessive alleles at the same two genes (r1r1r2r2)
R1 and R2 alleles are dominant over r1 and r2, respectively

1st Cross: a true-breeding red plant with a true-breeding white plant

Parentals) R1R1R2R2 x r1r1r2r2

Gametes) R1R2, R1R2, R1R2, R1R2

r1r2, r1r2, r1r2, r1r2

F1) 100% R1r1R2r2

2nd Cross: F1 progeny are selfed

Parentals) R1r1R2r2 x R1r1R2r2

Gametes) R1R2, R1r2, r1R2, r1r2

R1R2, R1r2, r1R2, r1r2

Punnett square) R1R2 R1r2 r1R2 r1r2

R1R2 R1R1R2R2 R1R1R2r2 R1r1R2R2 R1r1R2r2

R1r2 R1R1R2r2 R1R1r2r2 R1r1R2R2 R1r1R2r2

r1R2 R1r1R2R2 R1r1R2r2 r1r1R2R2 r1r1R2r2

r1r2 R1r1R2r2 R1r1r2r2 r1r1R2r2 r1r1r2r2

F2) Genotype:

1/16 R1R1R2R2 (dark red)
2/16 R1R1R2r2 (red)
1/16 R1R1r2r2 (light red)
2/16 R1r1R2R2 (red)
4/16 R1r1R2r2 (light red)
2/16 R1r1r2r2 (very light red)
1/16 r1r1R2R2 (light red)
2/16r1r1R2r2 (very light red)
1/16 r1r1r2r2 (white)

Phenotype:

1/16 R1 R1 R2R2, dark red phenotype
4/16 R1r1R2R2 + R1R1Rr2, red phenotype
6/16 R1r1 R2r2 + r1r1R2R2 + R1R1r2r2, light red phenotype
4/16 R1r1 r2r2 + r1r1R2r2, very light red phenotype
1/16 r1r1r2r2, White phenotype phenotype

Phenotypic ratio: 1:4:6:4:1

Frequency table:

<u>DOSAGE FREQUENCY</u>

Dark red 1/16

Red 4/16

Light red 6/16

Very light red 4/16

White 1/16

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