Question

20 POINTS - MONOHYBRID CROSS

Complete the following monohybrid cross.
Two parents that are heterozygous for brown eyes.

Be sure to identify the genotypes of the parents, complete the Punnett square, identify the phenotypes with genotypes and the ratio of the phenotypes.

What percent of the offspring have blue eyes?

Answer 1

Eye color
Father has brown eyes and is heterozygous (Bb).
Mother has Brown eyes and is heterozygous (Bb).
Check the attached doc for the punnet square;
Resulting offspring;
Genotype Ratio;  1 BB to 2Bb to 1 bb
Phenotype Ratio; 3 Brown eyes to 1 blue Eyes
Therefore; The chance of this couple having a child with blue eyes will be;
 = 1/4 or a 25% chance

Answer 2

Answer:

25%

Explanation:

if the parents are both heterozygous then you emidiatly have to know 75%  or 25% and since both parents have brown eyes than the possibility of the child having blue eyes is 25%