Question

Outline a project which aims to find the dominant coat color in dogs.

Answer 1

Hint: Dogs have a number of genes that control the color of coats. There are at least 11 gene series (A, B, C, D, E, F, G, M, P, S, and T) known that affect the color of the coat in dogs. A dog inherits from both of its parents one gene. In the phenotype, the dominant gene gets expressed. A dog may be genetically black or brown, for instance, in the B series.

Complete step by step answer:
In dogs, coat color is governed by a range of genes. At least 11 genes that affect the color of a dog's coat have been identified. A dominant gene is a gene found in both homozygous and heterozygous conditions, while a recessive gene is expressed only in homozygous conditions.
Let's consider that homozygous black (BB) is one parent and homozygous brown (bb) is another parent. The offspring with the genetic make- up Bb is formed by a cross between the two parents. We don't know if black is dominant now, or brown is dominant now. We can tell which one is a dominant trait by observing the produced off- springs. If the F1 generation is black, we can say that black is dominant, and if it is brown, we can say that brown is dominant.

- Choose two types of dogs, one with a white coat, the other with a black coat.
- Crossbreed them with one variation of a male dog and the other variation with a female dog.
- Observe the color of the F1 generation's offspring.
- Now, bring about breeding among the F1 generation species.
- Observe the coat color of F2 generation species (pups) and note the differences in coat color.
- Draw conclusions based on your analysis.
The possible inheritance pattern could be:
3:1 phenotypic ratio
Color of the black coat (3): White coat color (1)

Note: Let us presume that homozygous black (BB) is one parent, while homozygous brown (bb) is the other parent. All the offspring are heterozygous (Bb) in this situation.
Since black (B) is dominant, all of the offspring will be black. They may have both B and b alleles, however. If these heterozygous pups are crossed, 25 percent homozygous black (BB), 50 percent heterozygous black (Bb), and 25 percent homozygous brown (bb) offspring will be generated.