In a population of rabbits, black fur (B) is dominant over white fur (b). If two
Practice Questions
Q1
In a population of rabbits, black fur (B) is dominant over white fur (b). If two heterozygous black rabbits (Bb) are mated, what is the expected phenotypic ratio of their offspring?
1:1
3:1
2:1
1:2:1
Questions & Step-by-Step Solutions
In a population of rabbits, black fur (B) is dominant over white fur (b). If two heterozygous black rabbits (Bb) are mated, what is the expected phenotypic ratio of their offspring?
Step 1: Identify the genotypes of the parent rabbits. Both are heterozygous black rabbits, which means their genotypes are Bb.
Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the parents. The rows and columns will represent the alleles from each parent.
Step 3: Fill in the Punnett square. The combinations will be: BB, Bb, Bb, and bb.
Step 4: Count the different genotypes from the Punnett square. You will have 1 BB, 2 Bb, and 1 bb.
Step 5: Determine the phenotypes based on the genotypes. BB and Bb both result in black fur, while bb results in white fur.
Step 6: Calculate the phenotypic ratio. You have 3 black rabbits (1 BB + 2 Bb) and 1 white rabbit (1 bb), giving a ratio of 3 black to 1 white.
