Y-linked Inheritance. Holandric genes are inherited by males only. Assuming that a man with hypertrichosis is married to a woman and they had children 1. what is the probability that his sons inherit the trait? 2. what is the probability that his daughters inherit the trait?
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Y-linked Inheritance. Holandric genes are inherited by males only.
Assuming that a man with hypertrichosis is married to a woman and they had children
1. what is the probability that his sons inherit the trait?
2. what is the probability that his daughters inherit the trait?
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- True or false? The most common form of Down's Syndrome results from a spontaneous, somatic, gene mutation.Analysis of Autosomal Recessive and Dominant Traits The father of 12 children begins to show symptoms of Huntington disease. a. What is the probability that Sam, the mans second-oldest son (II-2), will suffer from the disease if he lives a normal life span? (Sams mother and her ancestors do not have the disease.) b. Can you infer anything about the presence of the disease in Sams paternal grandparents?Equalizing the Expression of X Chromosome Genes in Males and Females Individuals with an XXY genotype are sterile males. If one X is inactivated early in embryogenesis, the genotype of the individual effectively becomes XY. Why will this individual not develop as a normal male?
- Y-linked Inheritance. One trait that is Y-linked is hypertrichosis of the ears. Suppose a man with hypertrichosis marries and has children, what is the chance of his sons getting the trait? His daughters? Why?Codominance in blood types. If a male with type A blood (with genotype IAi) mates with a female having type B blood (with genotype IBi), what are the phenotypic ratios for the blood types of the offspring? ___ A : ___ B : ___ AB : ____ O Suppose that one parent has type AB blood, and the blood type of the other parent is not known. Describe how a child can (or cannot) have the following blood types: Type A Type B Type AB Type OAutosomal Recessive Inheritance (trait only expressed if homozygous recessive)An albino man (nn) marries a normally pigmented woman (N_) who has an albino mother. What is the chance that their children will be albino?
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- Unpacking the Problem 44John and Martha are contemplating having children, butJohn’s brother has galactosemia (an autosomal recessivedisease) and Martha’s great-grandmother also had galactosemia. Martha has a sister who has three children, none ofwhom have galactosemia. What is the probability that Johnand Martha’s first child will have galactosemia?1. Can the problem be restated as a pedigree? If so, writeone.2. Can parts of the problem be restated by using Punnettsquares?3. Can parts of the problem be restated by using branchdiagrams?4. In the pedigree, identify a mating that illustratesMendel’s first law.5. Define all the scientific terms in the problem, and lookup any other terms about which you are uncertain.6. What assumptions need to be made in answering thisproblem?7. Which unmentioned family members must be considered? Why?8. What statistical rules might be relevant, and in whatsituations can they be applied? Do such situations existin this problem?9. What are two generalities…Genetics Problem: "Which of the following is typically associated with an autosomal recessive pattern of inheritance?" a. an affected offspring has one or more affected parents b. two affected heterozygous individuals will have 25% of their offspring unaffected c. an affected offspring has two unaffected parents d. an affected individual with one affected parent will have 50% of its offspring affectedRecessive epistasis: In a cross between fruit flies that are both double heterozygous for modifier gene and coat color, in the total offspring of 192, how many fruit flies have gray- coat, white coat, and black coat? A recessive allele blocks the expression of the coat color of fruit flies. Show your answer and solution.
