Respuesta :

josinclair73

Answer:

Considering that white eyes are a recessive trait in flies, it is possible for two red-eyed flies to have offspring with white eyes only if both are heterozygous for this trait.

Explanation:

For two individuals with dominant phenotype for a trait to have offspring with the recessive trait, both must have a heterozygous genotype.

In the case of the characteristic eye color of the flies :

  • Red eye (R) is dominant trait.
  • White eyes (r) is the recessive trait.

When both parents are heterozygous, their genotype is Rr

In Punnett Square it can see the result of the crossing of these individuals:

Punnett Square :

Rr X Rr

Alleles     R     r

R              RR   Rr

r               Rr    rr

In the offspring, the probabilities are:

  • 50% heterozygous individuals Rr, with red eye phenotype.
  • 25% pure dominant individuals RR, with red eyes
  • 25% individuals with the recessive rr genotype, white eyes.

This is the possibility of two red-eyed flies having white-eyed offspring.

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