Genetics Chapter 4:
A color-blind woman with Turner syndrome has a father who is color-blind. Given that the gene for the color-blind condition is recessive and X-linked, provide a likely explanation (name and define the phenomenon involved) for the origin of the color-blind and cytogenetic conditions in the woman.
The phenomenon which leads to a color-blind woman with Turner syndrome from a color-blind father is called non-disjunction. Non-disjunction is a failure of segregation of chromosomes during cell division which leads to development of errors in chromosome number, such as monosomy X i.e N-1 where N is the chromosome number (Turner syndrome) or trisomy 21 (Down syndrome).
In the given conditions, the father is a color-blind which passes the mutant allele to his daughter, thus giving the color-blindness to her. Along with this character, the daughter has Turner syndrome meas 45,XO condition i.e partial deletion of X chromosome. This can only be explained by the fact that the non-disjunction must have occurred in the mother because the fertilization happened between an X-bearing sperm, which carried the mutant allele for color blindness, and a nullo-X egg.
Genetics Chapter 4: A color-blind woman with Turner syndrome has a father who is color-blind. Given...
A woman with x-linked color blindness and turners syndrome had a color blind father and a normal mother. In which of her parents did nondisjunction of the sex chromosome occur?
A healthy woman with a color blind father married an unaffected man, and their first child, a boy, had hemophilia. Both color blindness and hemophilia are due to x-linked recessive mutations and the relevant genes are separated by 20 cM. This couple plans to have a second child. What is the probability of having: a) a boy with hemophilia (regardless of his vision) b) a color blind girl without hemophilia? c) a child with both hemophilia and color blindness? d)...
Genetics question!! Please help with these 3. Thanks A woman with Turner syndrome (X0-only one X-chromosome) is also colorblind (an X-linked recessive phenotype). Both of her parents have normal color vision. This women's karyotype and genotype could have arisen by: a) a mutation in her mother's X-chromosome b) non-disjunction in mitosis c) non-disjunction in meiosis 1 in her father d) non-disjunction in meiosis 2 in her mother e) non-disjunction in meiosis 1 in her mother 10. Mitochondrial genomes a) replicate...
A woman with the recessive, X-linked disorder hemophilia has children with a male who is color-blind, also a recessive X-linked disorder. What is the probability that their children will have hemophilia and have normal vision? a. 0 b. 1/4 c. 1/2 d. 3/4 e. 1
Red-green color blindness is X-linked recessive. A woman with normal color vision has a father who is colorblind. The woman has a child with a man with normal color vision. What is the probability their child is a boy and is colorblind? A. 1/8 B. 1/4 C. 1/2 D. 3/4 E. 0
A woman with albinism (an X-linked recessive gene) has a child with a man who has normal pigment. Their child has albinism with Klinefelter's syndrome (XXY). Where did the non-disjunction event occur? a.Could only have occurred in the mother b.Can't determine from the information given. c.Could only have occurred in the father d.Could have occurred in either the mother or the father
Colorblindness and Hemophilia A are X-linked recessive conditions. A woman heterozygous for hemophila mutation and a colorblind man have a son who is haemophilic and has Klinefelter's syndrome (XXY). Which of the following nondisjunction events is the most compatible with the situation described? Please provide an explanation a. meiosis I, mother b. meiosis II, mother c. meiosis I, father d. meiosis II, father e. a and b
question 5-52 93 Dd D) dd D) aa x aa C) human height E) DI 4.Which of these crosses will only produce heterozygous offspring? B) AA x Aa C) Aa x Aa E) Aa x aa 5. Which of the following human traits is an example of codominance? A) sickle-cell anemia D) AB blood type B) variation in eye color 6. Which of the following is true regarding an individual who has inherited one sickle-cell gene and one normal gene...
NAME: 6. Red-green color deficiency is an X-linked recessive trait. A woman with normal color vision has a father who is color-deficient. The woman has a child with a man with normal color vision. Which phenotype is NOT expected as a possibility for that child? a) a color-deficient male b) a color deficient female c) a male with normal color vision d) a female with normal color vision 7. Which of the individuals in the human pedigree shown below allow...
Please provide answes with punnet's squares 7. If a woman who is red-green colorblind (sex linked!) mates with a man with normal vision, what phenotypes would one expect their children to have? Practice Genetic Problems a) all their children would be color blind; b) all their daughters will be color-blind, but all their sons will have normal vision. c) all their daughters will be carriers and all their sons will be color-blind. d) all their daughters will have normal vision...