4

Question 1

What determines the phenotype?

Answer 1

The genotype determines the phenotype.

Question 2

What is the phenotype for the genotype HBAHBA?

Answer 2

Phenotype normal.

Example: HBAHBA (sain) → phénotype normal.

Question 3

What is the phenotype for the genotype HBS/HBS?

Answer 3

Phenotype anormal.

Example: HBS/HBS (malade) → phénotype anormal.

Question 4

What is the utility of studying a family tree?

Answer 4

To understand the mode of transmission of a genetic disease (autosomale, gonosomale, récessive, dominante).

Question 5

What is an example of a recessive autosomal disease?

Answer 5

Sickle cell disease (drépanocytose).

Question 6

What are the risks for the child if both parents are carriers (M’m) of a recessive autosomal disease?

Answer 6

25% malades (m’m), 50% porteur sain (M/m), 25% sain (MM).