Question: What patterns appear when two traits are inherited? 1. Observe: Breed a black-fur, black-eye mouse with a white-fur, red-eye mouse. Click Breed several times, and then drag two of the offspring into the Holding Cages below. Move the cursor over a mouse to see its genotype, or allele combination. A. What is the genotype of the black-fur parent? _______________ B. What is the genotype of the white-fur parent? _ C. What are the genotypes of the offspring? ____________________

In complete dominance, the dominant allele hides the expression of the recessive allele. Heter0zyg0us individuals carry both alleles but express the dominant trait. A. FF / B. ff / C. Ff

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This problem proposes a situation that involves two somatic diallelic genes expressing mendelian inheritance with complete dominance.

One of the genes codes for fur color, while the other gene codes for eye color.

Since the question is focused on fur color, we are going to perform the crosses using this single gene.

Let us name the gene for fur color F

Allele F is dominant and expresses black color
Allele f is recessive and expresses white color

When the dominant allele completely masks the recessive allele, we talk about complete dominance. This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant trait. The dominant allele is hiding the expression of the recessive allele.

According to this, we can assume the following possible genotypes and phenotypes

Genotypes Phenotypes

FF H0m0zyg0us dominant Black

Ff Heter0zyg0us Black F allele masks f allele

ff H0m0zyg0us recessive White

The dominant trait is black, while the recessive one is white.

When you place the parent black and white mice on their corresponding boxes, and click breed several times, you always get black mice. The whole progeny is black, no matter what.

This is suggesting you that

The black parental is h0m0zyg0us dominant for the fur color.

Of course, the other parental is h0m0zyg0us recessive for white color.

And if this is the case, then the whole progeny expresses the dominant trait (black) but has the heter0zyg0us genotype.

So, let us perform the cross

Cross : Black mouse x White mouse

Parentals) FF x ff

Gametes) F F f f

Punnett square) F F

f Ff Ff

F1) 100% of the progeny is expected to be Ff, heter0zyg0us and black-

furred.

As you can see, no matter how numerous is the F1, all individuals will be heter0zyg0us black .

A.What is the genotype of the black-fur parent? H0m0zyg0us dominant FF

B. What is the genotype of the white-fur parent? H0m0zyg0us recessive ff

C. What are the genotypes of the offspring? Heter0zyg0us Ff

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