Answered: . Mother's genotype = AA Father's…

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter4: Pedigree Analysis In Human Genetics

Section: Chapter Questions

Problem 1CS: Pedigree analysis is a fundamental tool for investigating whether or not a trait is following a...

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This exercise is designed to give you some practice with Punnett squares and Mendel's principals of inheritance. Melanin is a chemical pigment produced in our body that contributes greatly to our skin, eye, and hair pigmentation -it also relates to color of fur, feathers, and such in animals. In general, the more melanin that is produced, the darker the color. A few genes contribute to the type and amount of melanin that is produced. Most people produce melanin in their skin, because it helps protect against the damages caused by the sun. This is why people tan. There is, however, a particular set of recessive alleles that cause a person to produce little or no melanin, and we refer to this as albinism. An animal or person who has little or no melanin is referred to as albino, and this can manifest in hair, skin, and eyes. For humans, this can be a rather dangerous condition as albinos are far more susceptible to sun damage, particularly cancer. In this exercise, the alleles are as follows: A = melanin, meaning the child's skin cells produce pigment. a = albino, meaning the child's skin cells produce very little or no pigment. In this exercise, you are going to complete Punnett squares to predict the possible outcomes of children from various parents. Once you have finished, write the expected genotype and phenotype ratios/percentages for the offspring of each pair in the space provided. (3 points each) 1. Mother's genotype = AA Father's genotype = AA ? | ? ________|________ ? | ? | Genotype Ratio Genotype Ration 2. Father's genotype = aa Mother's genotype = aa ? | ? ________|________ ? | ? | Genotype Ratio Genotype Ratio

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