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Question

The gene for brown eyes is dominant over the gene for blue eyes. Identify the correct statements from the following.


A
Both brown-eyed parents can have blue-eyed child.
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B
Both blue-eyed parents will have a blue-eyed child.
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C
Blue-eyed person will always have both their alleles different from a brown-eyed person.
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D
For a child to be brown-eyed, atleast one parent should be brown-eyed.
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Solution

The correct options are
A Both brown-eyed parents can have blue-eyed child.
B Both blue-eyed parents will have a blue-eyed child.
D For a child to be brown-eyed, atleast one parent should be brown-eyed.

Genotype for blue-eyes: bb.
Genotype for brown-eyes: BB or Bb.
There is probability of  having blue-eyed child, only when the parents are brown-eyed with heterozygous condition.
As blue-eyed is a recessive condition, if the parents are blue-eyed (bb), their child will be always blue-eyed.
Parent with either BB or Bb genotypes can have children with brown eyes even if the other parent's genotype is bb.
Alleles in a blue eyed person will be completely different from brown eyed person, only if the genotype of latter is homozygous. Heterozygous brown eyed person (Bb) and a blue eyed person (bb) shows similarity in one allele (b). 
 

Biology

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