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**(1 point)
Responses
BB
BB
Bb
Bb
BB and bb
BB and bb
bb
thats not an answer choice
pick between
BB
BB
Bb
Bb
BB and bb
BB and bb
bb
To determine which genotypes for this dog breed would lead to a spotted phenotype, we can use a Punnett square. A Punnett square is a tool used to predict the possible outcomes of a genetic cross between two individuals.
In this case, we're given that the allele B for a black coat is dominant, and the allele b for a spotted coat is recessive. The genotype for a black coat can be either BB or Bb, while the genotype for a spotted coat is bb.
To use a Punnett square, we will cross individuals with different genotypes and then analyze the resulting genotypes of their offspring. Let's use the genotypes BB and bb in our Punnett square:
| B | B |
-------------------
b | Bb | Bb |
-------------------
b | Bb | Bb |
From the Punnett square, we can see that all of the resulting genotypes (Bb, Bb, Bb, and Bb) will have a mix of dominant (B) and recessive (b) alleles. Since the recessive allele (b) is responsible for the spotted coat, any individual with the genotype bb would exhibit the spotted phenotype.
Therefore, the correct answer is bb.