Question: Bicoid is a strict maternal-effect gene in Drosophila; that is, it is not expressed in the zygote…
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Show transcribed image text Bicoid is a strict maternal-effect gene in Drosophila; that is, it is not expressed in the zygote. Recessive mutations in bicoid (bcd) cause embryonic death by preventing the formation ot anterior structures, such as the brain. Unlike bicoid, the fruitless (fru) gene is a sex-influenced gene that encodes a zinc-finger transcription factor that regulates the genes for male sexual behavior. Males homozygous for the fru mutation are sterile and court other males in contrast to females, which are unaffected. A) Predict all possible phenotypes and genotypes of (a) animals produced by mating bedfru/bcd fru males and females; (b) animals produced by mating bedfru/bedfru females with bedfru/beetfru males; (c) animals produced by mating bedfru/bedfru+ females with bed!"fru I bedfru males; (d) animals produced by mating bcdfrul beet fru females with bedfru/bedfru males; (e) animals produced by mating bedfru! bedfru females with bedfru/bedfru males; (f) animals produced by mating bedfru/bcd+fru females with bedfru/bedfru males. Use punnett squares or diagrams to support your answers. B) For each cross, calculate the probability of producing a female that can give rise to viable offspring that are fertile assuming that the two genes are 1) not linked 2) linked. Show your work to receive credit.
Bicoid is a strict maternal-effect gene in Drosophila; that is, it is not expressed in the zygote. Recessive mutations in bicoid (bcd) cause embryonic death by preventing the formation ot anterior structures, such as the brain. Unlike bicoid, the fruitless (fru) gene is a sex-influenced gene that encodes a zinc-finger transcription factor that regulates the genes for male sexual behavior. Males homozygous for the fru mutation are sterile and court other males in contrast to females, which are unaffected. A) Predict all possible phenotypes and genotypes of (a) animals produced by mating bedfru/bcd fru males and females; (b) animals produced by mating bedfru/bedfru females with bedfru/beetfru males; (c) animals produced by mating bedfru/bedfru+ females with bed!"fru I bedfru males; (d) animals produced by mating bcdfrul beet fru females with bedfru/bedfru males; (e) animals produced by mating bedfru! bedfru females with bedfru/bedfru males; (f) animals produced by mating bedfru/bcd+fru females with bedfru/bedfru males. Use punnett squares or diagrams to support your answers. B) For each cross, calculate the probability of producing a female that can give rise to viable offspring that are fertile assuming that the two genes are 1) not linked 2) linked. Show your work to receive credit.
