Haemophilia is an X-linked recessive disorder. If a woman is a carrier for haemophil. and has a child with a man who does not have haemophila, what is the probability a them having a child who has haemophilia? 75% of their children will have haemophilia. 25% of their children will have haemophilia. 100 % of their children will have haemophilia. 50% of their children will have haemophilia.

What is the probability of a hemophiliac daughter if the mother is a carrier and the father is normal? Remember hemophilia is caused by a recessive X-linked allele. 1/2 01 00 3/4 OC

What is the most likely mode of inheritance for this trait? I 1 2 1 2 3 4 6 7 OLO 2 3 4 5 6 7 8 9 10 4 5 6 II E III IV 1 □□ 1 2 3 X-linked dominant X-linked recessive Y-linked autosomal recessive autosomal dominant 5

Achondroplasia,is characterized by difficulty converting cartilage to bone and thus results in shortened limbs. This trait is autosomal dominant. (A = achondroplasia allele; a = average height allele.) A husband and wife both have achondroplasia. The couple have a total 12 living children: 6 boys and 6 girls.  The husband is colorblind, which is an X-linked recessive trait, and the wife believes there is a chance she is a carrier of colorblindness, since that trait runs in her family. One of the couple’s daughters and three of their sons are colorblind.  (Xc = colorblindness allele; XC = normal color vision allele.) a) Please list all of the different gametes that the husband can produce. b) Please list all of the different gametes that the wife can produce.

1. Hemophilia is due to a sex-linked gene. It is recessive and found on the X chromosome. A woman who is a carrier for hemophilia marries a normal man. What will be the possible phenotypes of their children? Use a punnet square. 2. A phenotypically normal man, who has a hemophiliac brother, marries a normal woman, who is not a carrier. What is the probability that any of their children will be hemophiliac? Use a punnet square. 3. Color-blindness is an X-linked, recessive trait. If a normal-sighted woman, whose father was color-blind, marries a colorblind man, what is the probability that they will have a son who is color-blind? Use a punnet square. 4. A man and woman, both of normal vision, have:  1) a color-blind son (#1) who has a daughter of normal vision  2) a daughter (#1) of normal vision who has one color-blind son and one normal vision son  3) another daughter (#2) of normal vision who has five sons, all with normal vision  What are the probable genotypes of the…

Hereditary hemochromatosis is an autosomal recessive genetic disorder that causes the body to absorb too much iron from the diet. This excess iron is stored in the body's tissues and organs, particularly the skin, heart, liver, pancreas, and joints. Because humans cannot increase the excretion of iron, excess iron can overload and eventually damage tissues and organs. A man who had hemophilia (an X-linked recessive genetic disorder), married a woman who had no family history of hemophilia whatsoever.  The couple had consulted a genetic counselor when they first contemplated having children due to concerns that their future children might have hemophilia.  Genetic testing of both future parents revealed that the husband did, in fact, possess the Hemophilia A allele but his wife was completely normal with respect to hemophilia.  Much to their shock, their first child, a daughter, had a mild blood clotting disorder.  Karyotyping was performed to determine whether this daughter had an…

A woman with Huntington’s disease (autosomal dominant trait, and she is heterozygous) has children with a healthy man. What proportion of their children will inherit Huntington’s disease?

Hemophilia is an X-linked disorder that affects the body’s ability to create blood clots. The allele for normal blood clotting, XH, is dominant over the allele for hemophilia, Xh.An unaffected female that is not a carrier mated with an affected male. Which of the following rows identifies the possible genotypes of the offspring?

A homozygous mother has retinoblastoma, a dominant sex-linked disorder carried on the X chromosome. The father does not have this disorder. What is the chance they will have a child with this disorder? 1) 0% 2) 25% 3) 50% 4) 75% 5) 100% 身

In humans, an X-linked disorder called coloboma iridia (a fissure in the iris_ is a recessive trait. A normal couple has an afflicted daughter. What would be the most plausible scenario for this situation?   the female is not the biological mother, but the male is the biological father   the father carries one recessive allele, and the mother carries one recessive allele   the mother carries two recessive alleles   the male is not the biological father, but the female is the biological mother   both parents are heterozygous for the trait