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In rabbits, black fur (B) is dominant to white (b), and long ears (E) are dominant toshort ears (e). What is the expected phenotypic ratio of the offspring ofa BBee x bbEE cross if these alleles sort independently? (B.6F)16 Black/Long Ears : 0 Black/Short Ears : 0 White/Long Ears : 0 White/ShortEars8 Black/Long Ears : 0 Black/Short Ears : 8 White/Long Ears : 0 White/ShortEars4 Black/Long Ears : 4 Black/Short Ears : 4 White/Long Ears : 4 White/ShortEars1 Black/Long Ears : 3 Black/Short Ears : 3 White/Long Ears : 9 White/ShortEars

2 Answers

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Final answer:

The expected phenotypic ratio for the offspring of a BBee x bbEE cross in rabbits is 16 Black/Long Ears : 0 Black/Short Ears : 0 White/Long Ears : 0 White/Short Ears, which means all offspring will have black fur and long ears.

Step-by-step explanation:

The question is related to Mendelian genetics and requires an understanding of dominant and recessive alleles, and independent assortment. In a cross between individuals with genotypes BBee and bbEE, the phenotypic ratio of offspring can be determined through the principles of dominance and independent assortment.

Considering the cross BBee x bbEE, we can predict that all offspring will inherit a B from the first parent and a b from the second, resulting in genotypes of Bb for fur color, which expresses the dominant phenotype, black fur. Simultaneously, all offspring will inherit an e from the first parent and an E from the second, resulting in genotypes of Ee for ear length, which expresses the dominant phenotype, long ears.

Therefore, all of the offspring will have black fur and long ears. The expected phenotypic ratio is thus 16 Black/Long Ears : 0 Black/Short Ears : 0 White/Long Ears : 0 White/Short Ears (100% Black/Long Ears).

User Zsolt Szatmari
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6.3k points
2 votes

Answer:

16 Black/Long Ears : 0 Black/Short Ears : 0 White/Long Ears : 0 White/ShortEars

Step-by-step explanation:

Black fur (B) is dominant over white (b) and long ears (E) is dominant over short ears (e).

BBee was crossed with bbEE:

BBee x bbEE (See the attached image for the Punnet's square)

Offspring:

16 BbEe - Black fur and Long ears

All other phenotypes are 0.

Hence, the answer would be 16 Black/Long Ears : 0 Black/Short Ears : 0 White/Long Ears : 0 White/ShortEars.

In rabbits, black fur (B) is dominant to white (b), and long ears (E) are dominant-example-1
User Neel Pathak
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5.4k points