Biology – The roles of genes in determining the phenotype | e-Consult
The roles of genes in determining the phenotype (1 questions)
Login to see all questions.
Click on a question to view the answer
Question 3 Answer:
a) Diagram of the cross:
| Parent 1: Cc | Parent 2: Cc |
b) Expected genotypes and phenotypes of the offspring:
- Genotypes: 25% CC, 50% Cc, 25% cc
- Phenotypes: 75% carriers (Cc), 25% affected (cc)
c) Explanation: Both parents are carriers, meaning they have one dominant C allele and one recessive c allele. The Punnett square shows the possible allele combinations. The probability of a child being affected (cc) is 25% because both parents must contribute a recessive c allele. The probability of a child being a carrier (Cc) is 50% because they can inherit either a C or a c allele from each parent. The probability of a child being unaffected and not a carrier (CC) is 25% because they must inherit a C allele from both parents.