Biology – The roles of genes in determining the phenotype | e-Consult
The roles of genes in determining the phenotype (1 questions)
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Let 'd' represent the recessive allele (disorder) and 'D' represent the dominant allele (no disorder). The woman's genotype is Dd, and her husband's genotype is DD.
Punnett Square:
| D | d | |
| D | DD | Dd |
| d | Dd | dd |
Genotype Ratio: 1 DD : 2 Dd : 1 dd
Phenotype Ratio: 3 normal (DD and Dd) : 1 affected (dd)
The probability of their child inheriting the disorder (dd) is 1/4 or 25%.