What unsual phenomenon is at work in each of the following disorders? b. Two couples are heterozygous for genes that cause albinism, but each genespecifies a different enzyme in the biochemical pathway for skin pigmentsynthesis. Their children, thus, do not face a 25% risk of having albinism.Answerc. Clara has severe neurofibromatosis type I. She has brown spots on her skinand several large tumors beneath her skin. A gene test shows that her sonhas inherited the disease-causing autosomal dominant allele, but he has nosymptoms.Answerd. Mateo, an apparently healthy 24-year-old basketball player, dies when hisaorta ruptures. A younger brother is nearsighted and has long and thinfingers, and an older sister is extremely tall, with long arms and legs. Theolder sister, too, has a weakened aorta. All of these siblings have Marfansyndrome.Answere. The B allele confers black coat color and the b allele brown coat color inLabrador dogs. When another gene, E, is inherited, the coat is golden nomatter what the B phenotype is. A dog of genotype ee expresses the blackphenotype.Answer

Disclaimer: Due to multiple sub-parts of the question, the first 3 (b, c, d) are being solved.

b. Two couples are heterozygous for genes that cause albinism, but each gene specifies a different enzyme in the biochemical pathway for skin pigment synthesis. Their children, thus, do not face a 25% risk of having albinism. Answer c. Clara has severe neurofibromatosis type I. She has brown spots on her skin and several large tumors beneath her skin. A gene test shows that her son has inherited the disease-causing autosomal dominant allele, but he has no symptoms

b. Two couples are heterozygous for genes that cause albinism, but each gene specifies a different enzyme in the biochemical pathway for skin pigment synthesis. Their children, thus, do not face a 25% risk of having albinism. Answer c. Clara has severe neurofibromatosis type I. She has brown spots on her skin and several large tumors beneath her skin. A gene test shows that her son has inherited the disease-causing autosomal dominant allele, but he has no symptoms

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter16: Human Genetics And The Human Genome

Section16.3: Genetic Diseases Caused By Single-gene Mutations

Problem 7LO: State whether each of the following genetic defects is inherited as an autosomal recessive,...

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