Test Index

JAMB Biology 2016 Paper

Question : 41

Total: 50

Solution:

Concept:

Sickle cell carrier is heterozygous (

AS

), while a normal person is homozygous (

AA

Explanation:

The carrier parent produces gametes

A

and

S

The normal parent produces only

A

gametes.

Crossing

AS

and

AA

yields offspring:

AA

AS

AA

AS

Out of 4 offspring, 2 are normal (

AA

Probability of a normal offspring =

\frac{2}{4} = 0.5

Answer:

0.5

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