In dogs, short tails (T) are dominant to long tails (t), and brown fur (B) is dominant to black fur (b). If a heterozygous dog with short tail and brown fur mates with a homozygous recessive dog with long tail and black fur, what are the possible phenotypes of their offspring?*1 pointShort tail with brown fur onlyLong tail with brown fur onlyShort tail with black fur onlyLong and short tail with both brown and black fur
Question
In dogs, short tails (T) are dominant to long tails (t), and brown fur (B) is dominant to black fur (b). If a heterozygous dog with short tail and brown fur mates with a homozygous recessive dog with long tail and black fur, what are the possible phenotypes of their offspring?*1 pointShort tail with brown fur onlyLong tail with brown fur onlyShort tail with black fur onlyLong and short tail with both brown and black fur
Solution
The heterozygous dog with short tail and brown fur has the genotype TtBb. The homozygous recessive dog with long tail and black fur has the genotype ttbb.
When these two dogs mate, we can use a Punnett square to determine the possible genotypes of their offspring.
The Punnett square would look like this:
| t | t | |
|---|---|---|
| T | Tt | Tt |
| t | tt | tt |
| B | Bb | Bb |
| b | bb | bb |
From this, we can see that the possible genotypes of the offspring are TtBb, Ttbb, ttBb, and ttbb.
These genotypes correspond to the following phenotypes:
- TtBb: Short tail with brown fur
- Ttbb: Short tail with black fur
- ttBb: Long tail with brown fur
- ttbb: Long tail with black fur
So, the possible phenotypes of their offspring are short tail with brown fur, short tail with black fur, long tail with brown fur, and long tail with black fur.
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