Question

Question
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If both parents have brown eyes, and both have one dominant and one recessive allele, what are the odds of the parents having an offspring with
blue eyes?
None of the offspring will have blue eyes.
There is a 25% chance of an offspring having blue eyes.
There is a 50% chance of an offspring having blue eyes.
All of the offspring will have blue eyes.
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Answer 1

Answer:

There is a 25% chance of an offspring having blue eyes.

Explanation:

A punnet square can be described as a diagram which is made to check the outcomes of a cross.

In the scenario discussed in the question, only one trait is being studied. Such a cross is termed as a monohybrid cross.

As both the parents are heterozygous for the trait, hence the punnet square can be made as follows:

       B             b

B   BB            Bb

b   Bb            bb

The results of this punnet square show that:

• there is 25% chance that the offspring will be homozygous for brown eyes.
• there is a 50% chance that the offspring will be heterozygous for brown color.
• there is a 25% chance that the offspring will be homozygous and have blue eyes.