# What is the probability that all four are normal? That three will be normal and one albino? Two normal and two albino? One normal and three albino? All four albino?

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Albinism in humans is controlled by a recessive gene (c) . From marriages between (Cc). Assume that such marriage (Cc x Cc) 4 children are produced.

Albinism in humans is controlled by a recessive gene (c) . From marriages between (Cc). Assume that such marriage (Cc x Cc) 4 children are produced.

##### 1 Answer

May 7, 2017

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When both parents are heterozygous (Cc) carrier, in each pregnancy there is 25% chance of birth of an albino i.e. 1 in 4. So, in each pregnancy, there is 75% chance of birth of a normal (phenotypic) child i.e. 3 in 4.

Probability of birth of all normal :

Probability of birth of all albino :

Probability of birth of two normal and two albino:

Probability of birth of one normal and three albino: