A Fruit Fly That Is True-Breeding for Gray Body, Vestigial

question 25

Essay

A fruit fly that is True-breeding for gray body, vestigial wings (b⁺ b⁺ vg vg)is mated with one that is True-breeding for black body, normal wings (b b vg⁺ vg⁺).
A)Draw the chromosomes for each P generation fly, showing the position of each allele.
B)Draw the chromosomes and label the alleles for an F₁ fly.
C)Suppose an F₁ female is testcrossed. Draw the chromosomes of the resulting offspring in a Punnett square like the one at the bottom of Fig. 15.10 in your textbook.
D)Knowing that the distance between these two genes is 17 map units, predict the phenotypic ratios of these offspring.

• A)Draw the chromosomes for each P generation fly, showing the position of each allele.
• B)Draw the chromosomes and label the alleles for an F₁ fly.
• C)Suppose an F₁ female is testcrossed. Draw the chromosomes of the resulting offspring in a Punnett square like the one at the bottom of Fig. 15.10 in your textbook.
• D)Knowing that the distance between these two genes is 17 map units, predict the phenotypic ratios of these offspring.

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