JAMB UTME - Biology - 2005 | Green Bridge CBT

Which of the following is the best explanation for a child who is phenotypically short and born of two tall parents

The father possesses a gene for shortness

The mother posesses a gene for shortness

Nature makes the child short

Both parents possess gene for shortness Respuesta correcta

Detalles de la respuesta

If a child is phenotypically short and both parents are tall, the most likely explanation is that both parents carry a recessive gene for shortness. When both parents are heterozygous for a recessive trait, there is a 25% chance that their child will inherit two copies of the recessive allele and express the trait. In this case, the trait is shortness. Therefore, it is most likely that both parents possess the gene for shortness, but it is only expressed in the child because they inherited two copies of the recessive allele.






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