Cystic fibrosis is a recessive disorder. If a child comes from two heterozygous parents, what is...

Cystic fibrosis is a recessive disorder. If a child comes from two heterozygous parents, what is the chance that the child will have it too?

25%

75%

50%

100%

Expert Solution

The correct answer is 25 %.

Cystic fibrosis is a genetically controlled disorder and primarily affects lungs. The disease symptoms appears in homozygous recessive condition.

Suppose, the gene causing cystic fibrosis is represented by letter "F". Hence, the dominant allele will be "F" and recessive allele will be "f".

individuals carring dominant gene both in homozygous condition (FF) and heterozygous condition (Ff) will not show symptoms of cystic fibrosis disease. However, homozygous recessive individuals (ff) will show the symptoms of the disease.

If two heterozygous parents are crossed, following results can be interpreted through punnett square:

Options, 75% , 50 % and 100 % are incorrect as explained in the punnett square above.

gladiator answered 1 year ago

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