Assuming this is a recessive trait.
HH = doesn't express trait
Hh = carrier
hh= express trait
Genotype:
1 HH
2 Hh
1 hh
1:2:1
Phenotype:
3:1
Doesn't express: express
25% chance of expressing trait.
When exposed to bright sunlight, some people involuntarily sneeze. This reaction is known as a photic response. It is controlled by a single gene with two alleles, H and h. A man and a woman who sneeze when exposed to bright sunlight are both heterozygous for the photic response trait. Draw a Punnett Square using the allele symbols H and h to show the expected genotypes of the man and woman’s biological children. Identify all possible phenotypes of the offspring and their expected percentages.
2 answers
Cont.
Assuming this is a dominant trait.
HH = Express trait
Hh = Express trait
hh= doesn't express trait
Genotype:
1 HH
2 Hh
1 hh
1:2:1
Phenotype:
3:1
Express: doesn't express
75% chance of expressing trait.
The wording of the question indicates autosomal dominant. The trait is expressed although both are heterozygous.
Assuming this is a dominant trait.
HH = Express trait
Hh = Express trait
hh= doesn't express trait
Genotype:
1 HH
2 Hh
1 hh
1:2:1
Phenotype:
3:1
Express: doesn't express
75% chance of expressing trait.
The wording of the question indicates autosomal dominant. The trait is expressed although both are heterozygous.