GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A
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a
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Either A or B
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None of the above
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Detailed explanation-1: -For example, the allele for brown eyes is dominant, therefore you only need one copy of the ‘brown eye’ allele to have brown eyes (although, with two copies you will still have brown eyes).
Detailed explanation-2: -Examples of Dominant Traits Curly hair is dominant over straight hair. Baldness is a dominant trait. Having a widow’s peak (a V-shaped hairline) is dominant over having a straight hairline. Freckles, cleft chin and dimples are all examples of a dominant trait.
Detailed explanation-3: -Dominant alleles are seen as an uppercase of a letter; for example, B. Recessive alleles are seen as a lower case of a letter; b.
Detailed explanation-4: -Allele refers to variants of the same gene that occur on the same chromosome. An allele is said to be dominant as they override or mask the effect of other variants available for the same gene. If both the alleles are the same, they are said to be homozygous and the character is expressed.