Question

in the dihybrid cross, brown hair (h) is dominant over blonde hair (h) and green eyes (g) is dominant blue eyes (g).

	hg	hg	hg	hg
hg	hhgg	hhgg	hhgg	hhgg
hg	hhgg	hhgg	hhgg	hhgg
hg	hhgg	hhgg	hhgg	hhgg

what fraction of the offspring are blonde and blue eyes?
○ 1/16
○ 9/16
○ 4/16
○ 2/16

Explanation:

Step1: Determine the genotype for blonde and blue eyes

Blonde hair is recessive (\(hh\)) and blue eyes are recessive (\(gg\)). So the genotype for blonde hair and blue eyes is \(hhgg\).

Step2: Count the number of \(hhgg\) in the Punnett square

Looking at the Punnett square, there is \(1\) cell with \(hhgg\).

Step3: Calculate the fraction

The total number of cells in the Punnett square is \(16\). The fraction of \(hhgg\) is \(\frac{1}{16}\).

Answer:

1/16