Question

. Imagine that you are a doctor in a maternity ward. During your last shift, 20 babies were born. 10 had blue eyes, and 10 had brown eyes. Remember genotypes are the two alleles given for each trait, written with a letter. For this activity B

Answer 1

The potential genotypes for newborns with brown eyes are BB and Bb, whereas the potential genotype for newborns with blue eyes is bb.

• According to the information provided above, b = allele for blue eyes is recessive while B = allele for brown eyes is dominant.
• A recessive allele is one that cannot express itself in the presence of a dominant allele, while a dominant allele conceals the effect of a recessive allele.
• A dominant allele expresses itself in the presence of a recessive allele.
• While a dominant allele can express itself in both a homozygous and heterozygous state, a recessive allele can only do so.
• Therefore, newborns with brown eyes will have two genotype options: BB and Bb, whereas those with blue eyes will only have one.

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