Reviewing Your Knowledge To practice doing monohybrid and dihybrid crosses, work the following problems. Each of the human traits used in the problems is determined by a since gene locus that has two different alleles, one dominant and one recessive. Show all of your work for the problems. Dominant Traits Recessive Traits Astigmatism (A Normalition ( Ability to rologue Cannot roll tongue Normal archesFlat Feetle) Widow’s peak0 Straightharine A man who has normal vision marries a woman who is heterozygous for astigmatism. What are the possible genotypes and phenotypes of both the parents and their possible children? 2. Two people who have normal arches produced a child who has flat feet. What is the genotype of the father? – What is the genotype of the mother? – What is the genotype of the child? Explain how you arrived at your answers 3.A woman has a widow’s peak, but she does not know her genotype. She marries a man who has a straight hairline and they have 13 children. Nine have widow’s peaks and four have straight hairlines – What are the genotypes of the parents? – What are the genotypes of the children? – Explain how you arrived at your answers A couple who both have the ability to roll their tongues have a son who is also a tongue-roller. The son is very curious as to whether he is homozygous or heterozygous for the tongue-rolling trait. How would he go about finding out? s. A man who has no freckles and flat feet marries a woman who is homozygous dominant for both traits. What is the man’s genotype? What genotype(s) will his gametes have?

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