In humans, hair texture exhibits incomplete dominance. The gene for curly hair (H) is incompletely dominant to the gene for straight hair (h). Individuals that are heterozygous (Hh) have wavy hair.
Two heterozygous parents have a child.
What is the chance that the child will have wavy hair?

If two heterozygous parents have a child the chance that the child has wavy hair will be 50% (1/2).

Parental cross:

Parental gametes (both parents):

Punnett square to determine allele segregation:

            H               h

H       1/4 HH        1/4 Hh

h        1/4 Hh        1/4 hh

In conclusion, if two heterozygous parents have a child the chance that the child has wavy hair will be 50% (1/4 Hh + 1/4 Hh = 1/2 Hh).

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1/2

Explanation:

the father and mother will have the gene version Hh. with these genes, there are 4 possible combinations:

H from mom and h from dad -> wavy hair

H from mom and H from dad  -> curly hair

h from mom and H from dad -> wavy hair

H from mom and h from dad -> straight hair

2/4, or 1/2, of the possible combinations lead to wavy hair , so there is a 50% chance that their child will have wavy hair.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

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