High School

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Dogs with black and white coat colors were allowed to reproduce. They produced 200 offspring, out of which 150 were black and 50 were white. Write the genotype of the black and white dogs.

A. BB and ww
B. Bb and ww
C. BB and Ww
D. Bb and Ww

Answer :

Final answer:

The genotypes of the black and white dogs are likely B )Bb for black and ww for white, as black is the dominant trait and the presence of white offspring indicates that black dogs carry the recessive allele.

Explanation:

The student's question relates to genotypes and coat color inheritance in dogs, which is a topic within genetics, a sub-discipline of biology. Assuming that black is a dominant trait (represented by "B") and white is recessive (represented by "w"), and given that the offspring population consists of 150 black and 50 white dogs, it is likely that the black dogs have the Bb genotype (heterozygous) and the white dogs have the ww genotype (homozygous recessive).

Since the presence of even one "B" allele will result in a black coat color, black dogs can be either BB or Bb. However, the presence of white offspring indicates that the black dogs must carry the recessive "w" allele to pass it on, hence, they are Bb. Therefore, the white dogs, expressing the recessive trait, must be ww.

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