Question 2 In humans, a dominant allele causes dimples (D) and a recessive allele causes a lack of dimples or no dimples to be present (d). If two people who are heterozygous have children what is the phenotypic ratio of their offspring? 3 dimples: 1 no dimples: 2 carriers 1 DD: 2 Dd: 1dd 1 DD: 1 Dd: 1 dD: 1 dd 3 dimples: 1 no dimples 2 no dimples: 1 dimples
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Both parents are heterozygous, so their genotypes are Dd. Show more…
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In humans, the allele for dimples (D) is dominant to the allele for no dimples (d). If two people who are heterozygous for the trait have children, what are the predicted phenotype ratios of their offspring? (Hint: Make a Punnett square on scratch paper.) All will have dimples 3 dimples : 1 no dimples 1 dimples ; 3 no dimples 2 dimples : 2 no dimples
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Dimples (little indentations in the cheeks) are a dominant genetic trait (D). Therefore, no dimples is a recessive trait (d). Imagine that a homozygous recessive female has children with a heterozygous male. Using this scenario, answer the questions below: What is the phenotype of the female? What is the phenotype of the male? (1) 2) Draw a Punnett Square showing the genetic cross of the female and male, showing the outcome of the genotypic and phenotypic frequencies. 3) The couple had children. All of them have dimples. Explain why this is possible given the genotypes found in your Punnett Square.
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The allele for dimples (D) is dominant to the allele for no dimples (d). A man heterozygous for dimples marries a woman who is also heterozygous for dimples. a.) What is the man's genotype and the woman's genotype? b.) What is the man's phenotype and the woman's phenotype? c.) Do a cross to determine all potential dimple genotypes and phenotypes for the offspring of this man and woman.
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