Page 205 - Science Course 3 (Book 1)

5. If the genotype of human
blood is ii, what is the
phenotype?

6. How is an organism’s gender
or sex determined? Explain.

7. Explain polygenic inheritance.

8. Give an example of polygenic
inheritance.

Mo5-L2: Key Concept Check

Direction: Use the diagram to answer each question on the lines provided.

This diagram shows the pedigree of a family with an
incidence of cancer across four generations.

1. How many members of this family had an incident of cancer?

2. According to the pedigree, has cancer ever skipped a generation in this family?

3. What is the ratio of unaffected females to affected females?

4. What is the ratio of affected females to affected males?

5. Who is more likely to have an incidence of cancer—females or males?

197