Maple syrup urine disease is an autosomal recessive gene. The R allele leads to a normal protein product, whereas r leads to a mutant protein. Which genotype below will display the Maple syrup urine disease phenotype? A. Rr B. RR C. rr D. Rr and rr
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Maple syrup urine disease is an autosomal recessive gene. The R allele leads to a normal protein product, whereas r leads to a mutant protein. Which genotype below will display the Maple syrup urine disease
A. |
Rr |
|
B. |
RR |
|
C. |
rr |
|
D. |
Rr and rr |
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- Joe has classic hemophilia, an X-linked recessive disease. Could Joe have inherited the gene for this disease from the following people? Yes No a. His mother's mother b. His mother's father c. His father's mother d. His father's fatherPlease choose the correct answer. If a recessive mutation kills an individual during the early stages of its development, what is the possible mode of inheritance exhibited if a recessive F1 with heterozygous parents survives? a. epigenetic inheritance b. maternal inheritance c. maternal effect d. organelle inheritanceWhich of the following does not have an environmental factor thataffects the distribution of the phenotype? a. phenylketonuria c. heightb. skin color d. Marfan syndrome
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- Two albino parents have four unaffected children. If albinism in the parents is given by mutations on two different genes (A and B) and complementation is observed in all four children, what are the genotypes of the parents? A. AaBb and AABB B. AABb and AaBB C. both parents are AaBb D. AAbb and BBaaMarfan Syndrome is a dominant trait inheritance in humans. It is a disorder that affects the connective tissue in many parts of the body. 1. What is/are the possible genotype/s of the mother if her husband does not exhibit the disease, but their children unfortunately got the disease? A. MM or Mm B. Mm only C. MM only D. mm only E. Mm or mm 2. What is/are the possible genotype/s of the children if both parents do not exhibit Marfan Syndrome disease? A. mm only B. Mm only C. MM only D. MM or Mm E. Mm or mm 3. What is the probability of having a normal child if the mother does not have the disease while her husband has the disease? A. 0% only B. 0% or 100% C. 0% or 50% D. 50% only E. 100% 4. What is the probability of having a girl child with Marfan Syndrome if both mother and father has the heterozygous genotype for the disease? A. 1/4 B. 1/2 C. 3/4 D. 3/8 E. 1/8Organism X has the genotype Ccdd. How many different types of gametes can it make and in what proportion? * A. 3 Cd 1 cd B. 1 CD: 1 Cd : 1 cD 1 cd C. 1 Cc : 1 dd D. 1 Cd 1 cd A human female "carrier" who is heterozygous for the recessive, sex-linked trait hemophilia (XHXH), marries a normal male (XHY). What proportion of their male progeny will show the trait? A. 1/4 B. 1/2 C. 0 D. All