EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Parents who both have brown eyes always have at least one offspring with grey eyes.
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Offspring from the same parents always inherit the same traits.
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Sometimes an offspring can show a variation of a trait that neither parent has.
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Eye color is not an inherited trait.
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Detailed explanation-1: -Both parents with brown eyes: 75% chance of baby with brown eyes, 18.8% chance of baby with green eyes, 6.3% chance of baby with blue eyes.
Detailed explanation-2: -Remember that different versions of genes can be dominant or recessive. What this means is that if you have one copy of each version of a gene, one will win out over the other. So someone with a brown OCA2 (B) and a blue OCA2 (b) will have brown eyes. Because brown (B) is dominant over blue (b).
Detailed explanation-3: -If both parents have brown eyes, a quarter of the children will have blue eyes, and three quarters will have brown eyes. The brown eye form of the eye color gene (or allele) is dominant, whereas the blue eye allele is recessive.
Detailed explanation-4: -Brown eye colour is dominant over blue eye colour. Therefore, for the brown-eyed parents having blue-eyed child, the possibility is that both have heterozygous genotype i.e. Bb. Therefore, from the square below, it is clear that there is a 25% possibility of blue-eyed (bb) child.