In fruit flies, the dominant H allele gives rise to a hairless phenotype, hh gives rise to normal body bristles, and the HH homozygote condition is lethal during an embryonic stage.  The presence of a dominant S allele suppresses the effect of the dominat H allele with respect to the body bristles phenotype such that normal body bristle phenotype is restored when only one dominant H allele is present (HH is lethal irrespective of the S or s alleles). The ss genotype has no effect over the H allele and the SS homozygote condition is also lethal during an embryonic stage.  What would be the expected phenotypic outcomes among the surviving offspring from the following cross: HhSs   X   hhSs   2 normal body bristles: 1 hairless 7 normal body bristles: 2 hairless 1 normal body bristles: 1 hairless 3 normal body bristles: 1 hairless 5 normal body bristles: 1 hairless

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
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In fruit flies, the dominant H allele gives rise to a hairless phenotype, hh gives rise to normal body bristles, and the HH homozygote condition is lethal during an embryonic stage.  The presence of a dominant S allele suppresses the effect of the dominat H allele with respect to the body bristles phenotype such that normal body bristle phenotype is restored when only one dominant H allele is present (HH is lethal irrespective of the S or s alleles). The ss genotype has no effect over the H allele and the SS homozygote condition is also lethal during an embryonic stage.  What would be the expected phenotypic outcomes among the surviving offspring from the following cross:

HhSs   X   hhSs

 
2 normal body bristles: 1 hairless
7 normal body bristles: 2 hairless
1 normal body bristles: 1 hairless
3 normal body bristles: 1 hairless
5 normal body bristles: 1 hairless
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