All of the cats who reside at the Ernest Hemingway Museum in Key West, Florida, carry at least one dominant allele for polydactyly. However, only about half the cats display an extra toe on their paws; the others have the expected number of toes. Which of the following is a possible explanation for this? O Variable expressivity O Variable penetrance O Cytoplasmic inheritance O Incomplete dominance Question 6 A gene that controls more than one trait is (Be sure to check your spelling on this one.)
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- Both members of a couple know that they are carriers of the cysticfibrosis allele. None of their three children has cystic fibrosis, but anyone of them might be a carrier. The couple would like to have a fourthchild but are worried that he or she would very likely have the disease,since the first three do not. What would you tell the couple? Would itremove some uncertainty from their prediction if they could find outwhether the three children are carriers?Skin color in humans is determined by polygenic inheritance, which means the more dominant alleles there are, the darker the skin color will be. A medium-toned skinned woman (AaBb) has a child with another medium-toned skinned man (AaBb). What is the probability of them having a very dark-toned skinned child? (Hint: the genotype is homozygous dominant)Given a cross between these two parents: BbCcDDEEFfGgHhjj x BbCcddEeFfGgHHjj where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following: What proportion of the offspring will phenotypically resemble the first parent? What proportion of the offspring will genotypically resemble the second parent? How many phenotypes can be expected from the cross?
- In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A). What is the genotype of someone who has cystic fibrosis? What are the two different genotypes that a healthy person could have? If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.In chickens, the Leghorn variety has white feathers due to an autosomal dominant allele. Silkies have white feathers due to a recessive allele in a second (different) gene. If a true-breeding whiteLeghorn is crossed to a true-breeding white Silkie, what is theexpected phenotype of the F1 generation? If members of the F1generation are mated to each other, what is the expected phenotypic ratio of the F2 generation? Assume the chickens in the parental generation are homozygous for the white allele at one gene andhomozygous for the brown allele at the other gene. In subsequentgenerations, nonwhite birds will be brown.Given a cross between these two parents: BbCcDDEEFfGgHhjj x BbCcddEeFfGgHHjj where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following: What proportion of the offspring will genotypically resemble the second parent?
- Given a cross between these two parents: BbCcDDEEFfGgHhJj x BbCcddEeFfGgHHjj where traits B, E, H, J exhibit Mendelian inheritance; C, and F exhibit incomplete dominance; D, and G exhibit co-dominance answer the following: How many possible gametes can the first individual produce? What proportion of the offspring will phenotypically resemble the first parent? What proportion of the offspring will genotypically resemble the second parent? How many phenotypes can be expected from the cross?Marfan’s syndrome is an example of pleiotrophy where individuals with a copy of the dominant allele have skeletal disorders, mitral valve prolapse and characteristic slender, loose joints. If Abraham Lincoln had a marfanoid disorder which he inherited from his mother, what are the chances he passed this trait on to his offspring? Consider that Mary Todd Lincoln, his wife, was 5’2”. please include a punnett squareIn humans, the allele for brown eye color (B) is dominant to blue eye color (b). If two heterozygous parents produce children, what are the following probabilities? **Note, this problem way over simplifies eye color, which is influenced by at least eight different genes. a. A total of four children, two with blue eyes and the other two with brown eyes. b. The first child has blue eyes, and the next two have brown eyes.
- In the multiple-allele series that determines coat color inrabbits, c+ encodes agouti, cch encodes chinchilla (a beigecoat color), and ch encodes Himalayan. Dominance is inthe order c+ > cch > ch. In a cross of c+/cch × cch/ch, whatproportion of progeny will be chinchilla?Assume that blood type is inherited as A and B dominant over O, but A and B are codominantover each other. Genotypes (IA IA) and (IA i) are then phenotypically type A, genotypes (IB IB) and(IB i) are type B, genotype (IA IB) is type AB, and genotype (i i) is type O blood. A man with bloodtype IA IA marries a woman with type AB blood. What are the genotypic and phenotypic ratios ofthe children?In the clover butterfly, males are always yellow, but females can beyellow or white. In females, white is a dominant allele. Two yellow butterflies were crossed to yield an F1 generation consisting of50% yellow males, 25% yellow females, and 25% white females.Describe how this trait is inherited and specify the genotypes ofthe yellow parents.