Albinism is a recessive disorder where there is a lack of melanin. Andrea and her husband Claude both have normal skin pigmentation. Andrea’s mother has the albino phenotype, but her father and her brother do not (normal pigmentation). Claude’s parents are both normal, but he has a sister who has the condition (is albino).  Answer the following questions   If Andrea and Claude are carriers for the albino allele, what is the probability that they have an albino child?    If Andrea and Claude have a second child, what is the probability this child be normal (non-albino)?

Mr. and Mrs. Flynn are concerned because their new baby doesn't resemble either of them and has type O blood. Mr. Flynn is type A and Mrs. Flynn is type B. They're sure that it's impossible to have a baby with a different blood type than the parents, and so they conclude that a mistake has been made. Are they correct? Explain your answer. Be specific. Use the correct blood alleles (IA, IB, i) in your explanation.   genotypes:   Mr. Flynn _________         Mrs. Flynn __________           their baby ___________ Display keyboard shortcuts for Rich Content Editor

Suppose a woman who is a carrier of sickle-cell trait (making her a heterozygote) has children with a man who is totally healthy and does not carry the gene for sickle-cell trait at all. Which one of the following is true about their potential children? (Draw a Punnett square on scratch paper if it helps you.) A) None of their children will have sickle-cell disease. B) All of their children will have sickle-cell disease. C) All of the couple's children would be heterozygous carriers like the mother.

The following pedigree shows the inheritance of Huntington’s disease, a fatal genetic disorder that causes neurodegeneration. Since signs and symptoms usually do not appear until adulthood, many who are carriers may not realize their risk of passing on the disease-causing allele.  The following pedigree represents a family in which some people are affected by Huntington’s disease.   Using just the information on this pedigree, is Huntington’s disease caused by a dominant allele or recessive alleles? What are the genotypes of the grandparents (I-1 and I-2)? What are the genotypes of the parents (II-6 and II-7)? If the parents above have another child, what is the chance that they will be affected by the Hungtington’s disease allele? What are the genotypes of the unaffected children (III-8, 9, 10)? What is the chance that the unaffected children above will pass on a Huntington’s disease allele to their children? What is the genotype of the affected child (III-11)? What is the chance…

Below is a pedigree chart for a family that has a history of Alkaptonuria.   Individuals infected with this condition can have darkened skin, brown urine, and can suffer from joint damage and other complications.  Given this pedigree answer the following questions.   Given the data in the pedigree chart is this genetic condition autosomal dominant or autosomal recessive? What are the genotypes for #1, #2, and #3?  If either of the 4th generation "aa" females were to mate with a homozygous dominant male would any of their offspring illustrate the phenotype?  Why or why not?

The allele for albinism ( c ) is recessive to the allele for normal pigmentation ( C ). A normally pigmented woman whose father is an albino marries an albino man whose parents are normal. They have three children, two normal and one albino. Give the genotypes for EACH person listed.

Albinism causes the skin, hair, or eyes to have little or no color. It is also associated with vision problems. Albinism results from an allele a that is recessive to the allele for normal melanin production. Maya has normal skin color, but her sister has albinism. Maya’s mother has albinism, and her father has normal skin color.   a)What are the genotypes of Maya, her sister, her mother, and her father.       b)If Maya’s parents have another child, what is the probability that this child will have albinism? Show the Punnett square you use to help in solving.       c)If Maya marries a man with albinism, what is the probability that their first child will have albinism? Show the Punnett square you use to help in solving.

Your brother has an autosomal recessive disorder, while you are unaffected. Neither one of your parents is affected. Explain how this is possible.

hemophilia is a sex linked recessive disease.  Dick does not have hemophilia.  His wife Debi is a heterozygote. They are having fraternal twins, one of each sex, who they have named Dick Jr. and Debi Jr.  What are the chances of Dick Jr. having hemophilia?  Debi Jr.?

Use the following information to answer the next question. The shape of the fruit of summer squash plants is determined by the interaction of two genes. The genotypes and corresponding phenotypes for the shapes of summer squash are given below. a. DDee b. ddee In order to determine the genotype of a squash with disc-shaped fruit a plant breeder would cross the disc- shaped plant with which of the following? Select one: c. ddEE Genotype D_E_ D_ee, ddE_ ddee d. DDEE Phenotype disc-shaped fruit sphere-shaped fruit long-shaped fruit