Paper 3 structured question: Monohybrid inheritance
Paper 3Theory (Core)3 marks
Diagram Description
Pedigree Chart
Generation 1: One shaded circle (female) and one unshaded square (male) married. Generation 2: They have four children: one shaded square, one unshaded circle, one shaded circle, and one unshaded square. Generation 3: The shaded square from generation 2 marries an unshaded circle. They have two children: one shaded circle and one unshaded square.
| Generation | Individual | Sex | Trait |
|---|---|---|---|
| 1 | Parents | Female | Has trait |
| 1 | Parents | Male | No trait |
| 2 | Child 1 | Male | Has trait |
| 2 | Child 2 | Female | No trait |
| 2 | Child 3 | Female | Has trait |
| 2 | Child 4 | Male | No trait |
| 3 | Child 1 | Female | Has trait |
| 3 | Child 2 | Male | No trait |
- a[1]
Identify Which parent in generation 1 has the trait?
Aim for approximately 1 distinct marking point.
- b[2]
State Is the trait likely dominant or recessive? Explain your answer.
Aim for approximately 2 distinct marking points.