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Brown eyes is dominant to light eyes. Mr.O’Ryan has blue (light) eyes. Mrs.O’Ryan is heterozygous for brown eyes. What are the color possibilities of their son?

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josinclair73

Answer:

Mr. and Mrs. O'Ryan are likely to have children with brown or blue eyes, with a 50:50 chance.

Explanation:

According to the genotypes of the parents, a cross can be made and the probability of the offspring having blue or brown eyes can be determined.

Genotypes:

Mr. O'Ryan bb (homozygous recessive) .

Mrs. O'Ryan Bb (heterozygous).

Bb X bb

Alelles        B         b

b                Bb       bb

b                Bb       bb

The result of the crossing is:

  • Heterozygous Bb descendants with a brown-eyed phenotype (50%).
  • Homozygous recessive descendants bb, with a blue-eyed phenotype (50%).

Mr. and Mrs. O'Ryan have the possibility to have both brown- and blue-eyed offspring.

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