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If both parents are heterozygous for a trait. the probability that an offspring will be...

Biology
JAMB 2021

If both parents are heterozygous for a trait. the probability that an offspring will be recessive for that trait is?

  • A. 1/2
  • B. 1/4
  • C. 1
  • D. 3/4
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Correct Answer: Option B
Explanation

In genetics, when both parents are heterozygous for a trait (Aa), the possible combinations for their offspring can be AA, Aa, aA, or aa. The probability of an offspring being homozygous recessive (aa) is 1 out of 4, or 1/4. So, the correct answer is '1/4'.

If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is 25%. When both parents are heterozygous (meaning they carry both the dominant and recessive alleles), there is a 1 in 4 chance that an offspring will inherit two recessive alleles and express the recessive phenotype. 

Heterozygous: An individual carrying both a dominant and a recessive allele for a trait. 

Recessive trait: A trait that is only expressed when an individual inherits two copies of the recessive allele. 


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