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- 7. The ability to roll your tongue (R) is dominant to lack of this ability (r). A. What is the genotype of a man who can roll his tongue if his father couldn’t? B. If a man who is heterozygous for tongue rolling marries a woman who is heterozygous, what would you predict for the genotypes and phenotypes of their children?13. Which of the following is true regarding X linked recessive traits? More males are affected than females because they have nothing to maska recessive allele carried on the X chromosome More females are affected than males because they have nothing to mask a recessive allele carried on the X chromosome. More females are affected than males because they have an extra X More males are affected than females because they have an extra X16. A woman who is type O marries a man who is heterozygous for type A. What are the chances that they will have a type O baby? Tracking two traits. Now it's time to track two traits at the same time.
- 3. Huntington's disease is an autosomal dominant condition in humans. The disease is often not diagnosed until adulthood, sometimes after the person has had children (and possibly passed the Huntington's allele to their children). People with Huntington's disease are usually heterozygous and not homozygous dominant. Assume that a person with Huntington's disease has a child with a person who does not have Huntington's disease. What is the probability that the child will have Huntington's disease? Support your answer with a Punnett square (on next page). 11. Armin and Annie are going to have a baby. Annie has dimples in her cheeks (a dominant trait), while Armin does not. You know that Annie's father has dimples in both cheeks, while her mother does not. Her mother must have the recessive trait. Annie's father has the dominant trait. but vou don't know if he is a homozygote or heterozygote. But you still know what Annie's genotype must be because Annie must have a recessive allele since that is all she could have inherited from her mother. Since Annie has a dimple you know she inherited a dominant allele from her father. What are the chances Armin and Annie's baby will have dimples? Determine the Phenotype and Genotype and its probability.4. Brown eyes are dominant over blue eyes. This is NOTA sex-linked trait. Cross a brown-eyed colorblind male (whose mother had blue eyes) with a normal blue-eyed female (whose father was colorblind). Genotype of the male Genotype of the female Genotypes Phenotypes What is the probability of getting offspring that are blue-eyed carrier females? (Remember that a carrier is a female that carries one copy of the sex-linked allele, but does not have the disease.) What is the probability of getting offspring that are blue-eyed? What is the probability of getting offspring that are blue-eyed colorblind males? What is the probability of getting offspring that are brown-eyed carrier females? What is the probability of getting offspring that are blue-eyed normal males? What is the probability of getting offspring that are colorblind?
- 9. In man, brown eyes (B) are dominant over blue eyes (b) and normal skin pigmentation (N) is dominant over albinism (n). A brown eyed, albino man whose mother had blue eyes and normal skin pigmentation and whose father was albino marries a blue eyed, normally pigmented woman whose father had brown eyes and was albino. (a) What is the woman's genotype? (b) What proportion of the couple's offspring would be expected to have brown eyes and normal skin pigmentation? (c) What proportion of the couple's offspring would be expected to have genotype Bbnn? (d) If the man were to marry a woman with the same genotype as his present father-in-law, what proportion of the offspring would be expected to have blue eyes and be albino? (e) If the woman were to marry a man with the same genotype as her present mother-in-law, what proportion of the offspring would be expected to be of genotype bbNN?1. Mary and Joe are both healthy individuals. Joe has a mother who suffered from cystic fibrosis, an autosomal recessive disorder. Mary has been genetically tested in order to find out if she has the allele responsible for this disease and her tests came out positive. They are planning on having two children together in the near future. What is the probability that she and Joe will have either 2 boys who have the disorder, OR that they have one boy who has the disorder and one boy who does not? (in other words, what is the probability that any of these two outcomes takes place? a) 1/8 b) 1/16 c) 3/32 d) 1/64 e) 9/647. While Squidward's family boasts about being a purebred line for dominant light blue skin color, they are also purebred for a less distinguished trait: the recessive trait of baldness. Lack of hair causes Squidward some self-esteem issues that he does not want his children to face. He would like to ensure that his offspring have hair AND with his blue skin color. What traits should he look for in a bride? A. Must she have hair? Explain. Squidward Traits: Skin Color B. Must she be blue? Explain. Blue = B, Green = b Hair Hair = H, Bald =h C. Squidward has found a potential bride prospect with the green squid Octavia. While Octavia has does not. Determine the chances of their child being blue and having hair. hair, her father Squidward's Genotype Octavia's Genotype = D. Use the genotypes in above to complete the Punnett square below and then answer the questions. E. Answer these questions based on your Punnett square. For which traits, if any, is it possible for their offspring to be…
- 9. Red-green color blindness is inherited as an X-linked recessive (Xc). If a color-blind man marries a woman who is heterozygous for normal vision, what would be the expected phenotypes of their children with reference to this character? In your answer, specify in your phenotype descriptions the gender of the children. (For example, don’t just say 75% of the children would be colorblind – you would instead say 100 % of the daughters would be colorblind and 50% of the sons would be colorblind. Note that this is not a correct answer; it is just to give you an idea of how to explain the correct phenotypes of the cross.)___1. Can two parents with dominant traits produce an offspring with recessive trait? Why?2. If both parents have recessive traits, can they produce an offspring with dominant character? Why?5. Red-Green colour blindness is inherited as an X-linked recessive trait in humans. A woman, who’s mother had red-green colour blindness marries a colour blind man. What are the chances that their child will be: 1. a colour-blind male? 4. a normal male? 2. a colour blind female? 5. a normal female? 5. The couple has a colour blind male child. What are the chances that their next child will be a normal female?