During ur last shift, 20 babies were born. 10 had blue eyes, and 10 had brown eyes
b- brown b- blue
given the phenotypes, what are the possible genotypes for these babies

Possible genotypes and their frequencies

Frequency of babies with blues eye having genotype "bb" is

Frequency of babies with brown eye having genotype "Bb" is

Frequency of babies with brown eye having genotype "BB" is

Explanation:

In a normal human being, brown eye color is dominant over blue eye color.

Thus B is dominant over b

Now,

Babies with blue eye colour will have genotype "bb" because it is a recessive trait thus both the alleles must be the recessive allele.

Therefore,

Thus

While the genotype of brown babies can be either homozygous dominant or heterzygous dominant

Now as per Hardy Weinberg's equation -

so

Thus frequency of babies with genotype "BB" is equal to

Now frequency of babies with genotype "Bb" is

Thus,

Frequency of babies with blues eye having genotype "bb" is

Frequency of babies with brown eye having genotype "Bb" is

Frequency of babies with brown eye having genotype "BB" is

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