Monohybrid crossesUsing Punnet square 6. In humans, the gene for tongue rolling (R) is dominant to non-rolling (r). A manhomozygous for rolling marries a woman who cannot roll her tongue. Predict the possiblegenotypes and phenotypes of their children.7. Nearly one in ten African Americans is carriers of the recessive sickle-cell allele. If twocarriers have a child, what is the likelihood that the child will suffer from sickle-celldisease? Must show both genotypic and phenotypic analyses.

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In humans, the gene for tongue rolling (R) is dominant to non-rolling (r). A man homozygous for rolling marries a woman who cannot roll her tongue. Predict the possible genotypes and phenotypes of their children.

In humans, the gene for tongue rolling (R) is dominant to non-rolling (r). A man homozygous for rolling marries a woman who cannot roll her tongue. Predict the possible genotypes and phenotypes of their children.

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

Section: Chapter Questions

Problem 8TYU

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Concept explainers

Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.

Question

Monohybrid crosses Using Punnet square

6. In humans, the gene for tongue rolling (R) is dominant to non-rolling (r). A man
homozygous for rolling marries a woman who cannot roll her tongue. Predict the possible
genotypes and phenotypes of their children.
7. Nearly one in ten African Americans is carriers of the recessive sickle-cell allele. If two
carriers have a child, what is the likelihood that the child will suffer from sickle-cell
disease? Must show both genotypic and phenotypic analyses.

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8. Huntington’s disease is a degenerative disease of the nervous system that strikes in middle age. The allele that causes the disease (H) is dominant to the allele that results in the normal condition (h). Answer the following questions about the inheritance of this disease. A. What is the genotype of a man who is normal but whose father had Huntington’s disease? B. What is the genotype of a woman who has Huntington’s disease if both of her parents had Huntington’s disease? C. If a man who is heterozygous for Huntington’s disease marries a woman who is normal, what would you expect for the genotypes and phenotypes of their children? D. If a normal man marries a woman who is homozygous for Huntington’s disease, what do you expect for the genotypes and phenotypes of their children?
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