What is the genotype for a GREY mouse?

What is the genotype for a GREY mouse?

yy
From the above discussion, the genotype of the gray mouse must be yy.

Which mouse is heterozygous for coat Colour?

Heterozygous mice have yellow coats, while homozygous dominant mice have black coats. However, having two copies of the recessive alleles is lethal.

What is the genotype of a black mouse?

Mice with genotype cc are albino because all pigment production and deposition of pigment in hair is blocked. At the second locus, the B allele (black agouti coat) is dominant to the b allele (brown agouti coat). A mouse with a black agouti coat is mated with an albino mouse of genotype bbcc.

What is the fur color of a mouse with the genotype BB?

Terms in this set (27) Fur color in a species of mouse is controlled by a single gene pair. BB animals are black and bb animals are white.

What is a 1 1 genotype ratio?

A 1:1 ratio among progeny suggest one gene is involved in the phenotype which would involve a cross between a heterozygote X homozygote parent. 5. A 2:1 ratio among the progeny suggest one gene is involved where the presence of both recessive alleles results in death (ex: Aa x Aa) 6.

How many possible genotypes are there?

six different genotypes
A description of the pair of alleles in our DNA is called the genotype. Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO. How are blood types related to the six genotypes?

Is the genotype DD heterozygous or homozygous?

Sally’s genotype is “dd”, so she is also considered homozygous. Susan’s genotype is “Dd”, so she is considered HETEROZYGOUS (has two different alleles for a specific gene). Although Susan has both the allele “D” to make dimples and the allele “d” in her genotype, her phenotype is the presence of dimples.

What would be the genotype for mice that are homozygous dominant for fur color?

For mice that are either homozygous dominant (PP) or heterozygous (Pp), the organism’s fur color is dictated by the other three genes (A/a, B/b, and C/c). For mice that are homozygous recessive (pp), large patches of the organism’s fur are white. This condition is called piebaldism.

Is BB dominant or recessive?

An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.

How do you find the genotype ratio?

To find the genotypic ratio, count the number of times each combination appears in the grid, starting in the upper left square. The example in Figure 1 below is crossing alleles for just one trait, flower color. Larger Punnett squares are used to calculate genotypic ratios for more than one trait as shown in Figure 2.

What is the dominant coat color in mice?

The wild-type coat color, agouti ( AA ), is dominant to solid-colored fur ( aa ). However, a separate gene ( C) is necessary for pigment production. A mouse with a recessive c allele at this locus is unable to produce pigment and is albino regardless of the allele present at locus A (Figure 1).

Why are mice with genotype cc albino?

Mice with genotype cc are albino because all pigment production and deposition of pigment in hair is blocked. At the second locus, the B allele (black agouti coat) is dominant to the b allele (brown agouti coat).

What is the genotype of the yellow mice in this cross?

All testcross data with the yellow mice give a 1:1 ratio. This ratio is typical of what is seen with heterozygous individuals. Therefore, all of the yellow mice from the cross of two heterozygous yellow mice are genotypically Yy. Somehow the YY genotype is lethal. The 2:1 ratio is the typical ratio for a lethal gene.

What is the genotype for agouti coat?

At the second locus, the B allele (black agouti coat) is dominant to the b allele (brown agouti coat). A mouse with a black agouti coat is mated with an albino mouse of genotype bbcc. Half of the offspring are albino, one quarter are black agouti, and one quarter are brown agouti.