In a certain dog breed, the allele B for a black coat is dominant, and the allele b for a spotted coat is recessive. What genotypes for this dog breed would lead to a spotted phenotype? **Make a Punnet square for help**
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To determine the genotypes that would result in a spotted phenotype, we need to create a Punnett square. Let's use the letters B and b to represent the alleles.
The possible genotypes of the parents would be:
Parent 1: Bb (spotted phenotype)
Parent 2: Bb (spotted phenotype)
The Punnett square would look like this:
| B b
-------|---------------
B | BB Bb
b | Bb bb
As we can see from the Punnett square, there are two possible genotypes that would lead to a spotted phenotype: Bb and bb.
so whats the answer
The answer is that the genotypes Bb and bb would lead to a spotted phenotype in this dog breed.
To determine the genotypes that would lead to a spotted phenotype in this dog breed, we can use a Punnett square. A Punnett square is a visual tool that allows us to predict the possible combinations of alleles that an offspring can inherit from its parents.
In this case, we have one dominant allele (B) for a black coat and one recessive allele (b) for a spotted coat. To create a Punnett square, we need to cross individuals with known genotypes to see which combinations can result in a spotted phenotype.
Let's consider crossing two dogs, both with a black coat (genotype BB). We represent the alleles of one dog on the top row and the alleles of the other dog on the left column. Their potential offspring will be displayed in the cells of the Punnett square.
| B | B |
---|---|---|
B | BB | BB |
---|---|---|
B | BB | BB |
As we can see, all the offspring (100%) from this cross have the genotype BB, which means they will have a black coat.
Now, let's consider crossing two dogs, both with a spotted coat (genotype bb). We use the same approach:
| b | b |
---|---|---|
b | bb | bb |
---|---|---|
b | bb | bb |
In this case, all the offspring (100%) will have the genotype bb, which means they will also have a spotted coat.
Lastly, let's consider crossing a dog with a black coat (BB) and a dog with a spotted coat (bb). Again, we use the same method:
| B | B |
---|---|---|
b | Bb | Bb |
---|---|---|
b | Bb | Bb |
In this case, all the offspring will have the genotype Bb, which means they will have a black coat. However, they will carry the recessive allele b for a spotted coat. This means that although they have a black coat phenotype, they could potentially produce offspring with a spotted coat if they breed with another dog that has the recessive allele (bb).
To summarize, in order to have a spotted phenotype, a dog must have the genotype bb.