Reciprocal Crosses for X-linked Recessive Inheritance mutant female X wild-type male wild-type female X mutant male P: (genotype) (genotype) (genotype) (genotype) Genotypes & Ratios: Phenotypes & Ratios: Genotypes & Ratios: Phenotypes & Ratios: F, intercross: F, intercross: (genotype) (genotype) (genotype) (genotype) Genotypes & Ratios: Phenotypes & Ratios: Genotypes & Ratios: Phenotypes & Ratios: F;

Reciprocal Crosses for X-linked Recessive Inheritance mutant female X wild-type male wild-type female X mutant male P: (genotype) (genotype) (genotype) (genotype) Genotypes & Ratios: Phenotypes & Ratios: Genotypes & Ratios: Phenotypes & Ratios: F, intercross: F, intercross: (genotype) (genotype) (genotype) (genotype) Genotypes & Ratios: Phenotypes & Ratios: Genotypes & Ratios: Phenotypes & Ratios: F;

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter12: Mendel's Experiments And Heredity

Section: Chapter Questions

Problem 26CTQ: The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is...

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Analysis of X-Linked Dominant and Recessive Traits A young boy is color-blind. His one brother and five sisters are not. The boy has three maternal uncles and four maternal aunts. None of his uncles children or grandchildren is color-blind. One of the maternal aunts married a color-blind man, and half of her children, both male and female, are color-blind. The other aunts married men who have normal color vision. All their daughters have normal vision, but half of their sons are color-blind. a. Which of the boys four grandparents transmitted the gene for color blindness? b. Are any of the boys aunts or uncles color-blind? c. Is either of the boys parents color-blind?
Analysis of X-Linked Dominant and Recessive Traits In the eighteenth century, a young boy with a skin condition known as ichthyosis hystrix gravior was identified. The phenotype of this disorder includes thickening of skin and the formation of loose spines that are sloughed off periodically. This man married and had six sons, all of whom had the same condition. He also had several daughters, all of whom were unaffected. In all succeeding generations, the condition was passed on from father to son. What can you theorize about the location of the gene that causes ichthyosis hystrix gravior?
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?
Analysis of X-Linked Dominant and Recessive Traits As a genetic counselor investigating a genetic disorder in a family, you are able to collect a four-generation pedigree that details the inheritance of the disorder in question. Analyze the information in the pedigree to determine whether the trait is inherited as: a. autosomal dominant b. autosomal recessive c. X-linked dominant d. X-linked recessive e. Y-linked
Variations on a Theme by Mendel Pea plants usually have white or red flowers. A strange pea-plant variant is found that has pink flowers. A selfcross of this plant yields the following phenotypes: 30 red flowers 62 pink flowers 33 white flowers What are the genotypes of the parents? What is the genotype of the progeny with red flowers?
Female fruit flies homozygous for the X-linked white-eye alleleare crossed to males with red eyes. On very rare occasions, an offspringof such a cross is a male with red eyes. Assuming these rareoffspring are not due to a new mutation in one of the mother’s Xchromosomes that converted the white-eye allele into a red-eyeallele, explain how a red-eyed male arises.
Ch. 14-4 Duchenne muscular dystrophy, which is inherited in an X-linked recessive pattern, nearly always occurs in males. Explain why.
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?
Inheritance regarding two un+linked genes, two loci with separate alleles from the mother, and two alleles from the father that results in an organism's genotype for those specific genes. A hereditary disease exists among humans called phenylketonuria, which is an autosomal recessive mutant allele. The father is homozygous for this condition where the mother is a carrier. The father is also bow-legged and heterozygote for this trait where the mother has straight legs. a.) show parents genotype for these two traits b.) Their first child was a daughter with straight legs and phenylketonuria. What was the probability for that to occur? c.) What was the probability that her future siblings were to be a brother and a sister (no particular order of sex) who are carriers of the disease and the brother to be bow-legged whilst the sister having straight legs? d.) If adding the blood types of the parents where the father is AB and the mother to be A. What is the probability for this couple to…
Co- Dominance1) In cattle, the alleles for red coat (R) and white coat (W) behave as the co-dominants. Both red and white hairs are produced in the heterozygote producing a coat pattern that is called "roan." a) Give the phenotypic and genotypic ratios to be expected among the offspring from a cross of two roan animals. b) What are the expected genotypic and phenotypic ratios from a cross of a roan animal and a white one?
Genetic cross with dependent assortment (linked traits). Repeat the previous problem but assume that the genes are located very close to each other on the same chromosome, and are therefore always linked (passed on together). Assume that in these individuals, each chromosome contains the dominant allele for one gene and the recessive allele for the other gene. Note: this is similar to the dependent assortment example in your notes, but the linkage is different. Construct a 2x2 Punnett square, and answer the questions below: GgBb x GgBb GB Gb gB gb GB GGBB GGBb GgBB GgBb Gb GGBb GGbb GgBb Ggbb gB GgBB GgBb ggBB ggBb gb GgBb Ggbb ggBb ggbb a) From your Punnett square, how many individuals are dihybrids? b) How many individuals are both homozygous recessive for coat color and heterozygous for eye color (ggBb)? c) Fill in the blanks to state the expected phenotypic ratio of the offspring:…
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?