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Puppy Genes

Science brain teasers require understanding of the physical or biological world and the laws that govern it.


Puzzle ID:#41820
Fun:*** (2.14)
Difficulty:** (1.47)
Submitted By:beepbeeptnmAus****




Jessica has two hamsters, one male and one female. The male hamster is brown, the dominant trait for hamsters. His genotype is Ff. The capital F represents the dominant trait for hamsters, which is brown fur. The lowercase f represents the recessive trait for hamsters which is white fur. The female hamster has white fur, the recessive trait for hamsters.

With these parents, there is a 50% chance of offspring whose phenotype (an organism's physical appearance) is heterozygous brown, and a 50% chance of an offspring whose phenotype is homozygous white.

What is the possibility of ever, with any two genotypes, having offspring whose phenotype is heterozygous white?



The results are impossible. White is a recessive trait and heterozygous means that there would have to be two different alleles. The only way to do that is with the genotype Ff, but since the dominant allele would always take over, the offspring would end up being brown.


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