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In fruit flies, having red eyes is dominant to white eyes. In a specific scientific cross, a heterozygous red-eyed fly is crossed with another heterozygous red-eyed fly.Fruit Fly (Drosophila immigrans) by Martin Cooper (CC BY 2.0)What percentage of their offspring will have white eyes?Elimination ToolSelect one answerA0%0%B25%25%C50%50%D75%75%

Question

In fruit flies, having red eyes is dominant to white eyes. In a specific scientific cross, a heterozygous red-eyed fly is crossed with another heterozygous red-eyed fly.Fruit Fly (Drosophila immigrans) by Martin Cooper (CC BY 2.0)What percentage of their offspring will have white eyes?Elimination ToolSelect one answerA0%0%B25%25%C50%50%D75%75%

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Solution

To solve this problem, we need to understand the basics of genetics.

The dominant trait is represented by a capital letter (R for red eyes) and the recessive trait is represented by a lower case letter (w for white eyes).

A heterozygous red-eyed fly has one dominant gene (R) and one recessive gene (w), so its genotype is Rw.

When a Rw fly is crossed with another Rw fly, we can use a Punnett square to predict the possible genotypes of their offspring:

  • The first row/column of the Punnett square is Rw (from the first parent)
  • The second row/column is also Rw (from the second parent)

The Punnett square looks like this:

R w
R RR Rw
w Rw ww

The Punnett square shows that:

  • 1 out of 4 offspring (25%) will have the RR genotype (red eyes)
  • 2 out of 4 offspring (50%) will have the Rw genotype (red eyes, because the dominant trait masks the recessive trait)
  • 1 out of 4 offspring (25%) will have the ww genotype (white eyes, because both genes are recessive)

So, 25% of their offspring will have white eyes. The correct answer is B25%.

This problem has been solved

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