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7. The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygou condition, H is lethal. The dominant allele S has no effect on bristle number except in the presence of H, in which case a single S allele suppresses the hairless phenotype, thus restoring the bristles. However, S is also lethal in homozygotes. a. What ratio of flies with normal bristles to hairless individuals would we find in the live progeny of a cross between two normal flies both carrying the H allele in the suppressed condition? b. When the hairless progeny of the previous cross are crossed with one of the parental normal flies from part (a) (meaning a fly that carries H in the suppressed condition), what phenotypic ratio would you expect to find among their live progeny?

7. The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygou condition, H is lethal. The dominant allele S has no effect on bristle number except in the presence of H, in which case a single S allele suppresses the hairless phenotype, thus restoring the bristles. However, S is also lethal in homozygotes. a. What ratio of flies with normal bristles to hairless individuals would we find in the live progeny of a cross between two normal flies both carrying the H allele in the suppressed condition? b. When the hairless progeny of the previous cross are crossed with one of the parental normal flies from part (a) (meaning a fly that carries H in the suppressed condition), what phenotypic ratio would you expect to find among their live progeny?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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7. The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygou condition, H is lethal. The dominant allele S has no effect on bristle number except in the presence of H, in which case a single S allele suppresses the hairless phenotype, thus restoring the bristles. However, S is also lethal in homozygotes. a. What ratio of flies with normal bristles to hairless individuals would we find in the live progeny of a cross between two normal flies both carrying the H allele in the suppressed condition? b. When the hairless progeny of the previous cross are crossed with one of the parental normal flies from part (a) (meaning a fly that carries H in the suppressed condition), what phenotypic ratio would you expect to find among their live progeny?
Transcribed Image Text:7. The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygou condition, H is lethal. The dominant allele S has no effect on bristle number except in the presence of H, in which case a single S allele suppresses the hairless phenotype, thus restoring the bristles. However, S is also lethal in homozygotes. a. What ratio of flies with normal bristles to hairless individuals would we find in the live progeny of a cross between two normal flies both carrying the H allele in the suppressed condition? b. When the hairless progeny of the previous cross are crossed with one of the parental normal flies from part (a) (meaning a fly that carries H in the suppressed condition), what phenotypic ratio would you expect to find among their live progeny?
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