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In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?
- a)25%
- b)50%
- c)75%
- d)100%
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
In mice, black coat colour (allele B) is dominant to brown coat colour...
The cross between black mouse (BB) and a brown mouse (bb) and the inbreeding of their hybrid progeny is shown below
Hence, phenotypic raio is 3 black : 1 brown i.e, 75 % of the progeny would have black coat.
Most Upvoted Answer
In mice, black coat colour (allele B) is dominant to brown coat colour...
Explanation:
To determine the percentage of progeny with black coats, we need to analyze the possible genotypes and phenotypes of the offspring.
Given information:
- Black coat color (allele B) is dominant to brown coat color (allele b).
- The parents of the offspring are a black mouse (BB) and a brown mouse (bb).
Step 1: Determine the genotypes of the parents
- The black mouse (BB) has the genotype BB, meaning it has two dominant alleles for black coat color.
- The brown mouse (bb) has the genotype bb, meaning it has two recessive alleles for brown coat color.
Step 2: Determine the genotypes of the offspring
When the parents are crossed, the possible genotypes of the offspring are:
- 100% of the offspring will inherit one allele from each parent, resulting in the genotype Bb.
Step 3: Determine the phenotypes of the offspring
The phenotype of an organism is its physical appearance or trait. In this case, the phenotype is the coat color.
When it comes to coat color, the dominant allele (B) produces black coat color, while the recessive allele (b) produces brown coat color.
Since the genotype of all the offspring is Bb, they will all have a black coat color. This is because the dominant allele (B) masks the presence of the recessive allele (b), resulting in a black coat color phenotype.
Therefore, the answer is option C) 75% of the progeny would have black coats.
Summary:
When a black mouse (BB) is crossed with a brown mouse (bb), all the offspring (Bb) will have a black coat color. This is because the black coat color allele (B) is dominant to the brown coat color allele (b).
To determine the percentage of progeny with black coats, we need to analyze the possible genotypes and phenotypes of the offspring.
Given information:
- Black coat color (allele B) is dominant to brown coat color (allele b).
- The parents of the offspring are a black mouse (BB) and a brown mouse (bb).
Step 1: Determine the genotypes of the parents
- The black mouse (BB) has the genotype BB, meaning it has two dominant alleles for black coat color.
- The brown mouse (bb) has the genotype bb, meaning it has two recessive alleles for brown coat color.
Step 2: Determine the genotypes of the offspring
When the parents are crossed, the possible genotypes of the offspring are:
- 100% of the offspring will inherit one allele from each parent, resulting in the genotype Bb.
Step 3: Determine the phenotypes of the offspring
The phenotype of an organism is its physical appearance or trait. In this case, the phenotype is the coat color.
When it comes to coat color, the dominant allele (B) produces black coat color, while the recessive allele (b) produces brown coat color.
Since the genotype of all the offspring is Bb, they will all have a black coat color. This is because the dominant allele (B) masks the presence of the recessive allele (b), resulting in a black coat color phenotype.
Therefore, the answer is option C) 75% of the progeny would have black coats.
Summary:
When a black mouse (BB) is crossed with a brown mouse (bb), all the offspring (Bb) will have a black coat color. This is because the black coat color allele (B) is dominant to the brown coat color allele (b).
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In mice, black coat colour (allele B) is dominant to brown coat colour (allele b). The offspring of a cross between a black mouse (BB) and a brown mouse (bb) were allowed to interbreed. What percentage of the progeny would have black coats?a)25%b)50%c)75%d)100%Correct answer is option 'C'. Can you explain this answer?
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