The hairless gene allele, H, in fruit flies, causes fruit flies to lack sensory hairs.  The H allele is dominant; the recessive allele, h, causes flies to have normal sensory hairs.  The dominant allele is lethal when homozygous. A second gene, suppressor of Hairless, Su(H), can block the phenotype of hairless. The dominant allele, Su(H), prevents the H allele from causing its phenotype, resulting in flies with sensory hairs.  The dominant Su(H) allele is also lethal when homozygous. The recessive allele, su(H), allows the H allele to cause its phenotype.  The Su(H) allele does not affect with the h allele. If you crossed a normal hair fly (of genotype H h Su(H) su(H) ) with another normal hair fly (of genotype H h Su(H) su(H) ), what proportions  or ratios of genotypes and phenotypes would you expect to observe in the offspring? Show your work.

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The hairless gene allele, H, in fruit flies, causes fruit flies to lack sensory hairs.  The H allele is dominant; the recessive allele, h, causes flies to have normal sensory hairs.  The dominant allele is lethal when homozygous.

A second gene, suppressor of Hairless, Su(H), can block the phenotype of hairless. The dominant allele, Su(H), prevents the H allele from causing its phenotype, resulting in flies with sensory hairs.  The dominant Su(H) allele is also lethal when homozygous. The recessive allele, su(H), allows the H allele to cause its phenotype.  The Su(H) allele does not affect with the h allele.

If you crossed a normal hair fly (of genotype H h Su(H) su(H) ) with another normal hair fly (of genotype H h Su(H) su(H) ), what proportions  or ratios of genotypes and phenotypes would you expect to observe in the offspring? Show your work.  

 

 

 

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