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3. The litter resulting from the mating of two short-tailed catscontains three kittens without tails, two with long tails, and sixwith short tails. What would be the simplest way of explaining theinheritance of tail length in these cats? Show the genotypes.

4. A normal vision man and woman produce three boys, one of whichis colorblind and the other two with normal vision. What are thegenotypes of the parents? (This is a sex-linked problem)

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Hubert KochLv2

7 Apr 2018

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Related questions

1. Saguaro cacti have 2 L-shaped arms and you have one with armsthat are different lengths. Arm length in the cactus is controlledby one gene. Arms of the same length (A) are dominant to arms of adifferent length (a). What is the genotype of our cactus? If youcross our cactus with your neighborâs cactus which has arms of thesame length and Â½ of the offspring have different length arms. Whatis the genotype of the neighborâs cactus?

2. The ability to curl your tongue up on the sides (T, tonguerolling) is dominant to not being able to roll your tongue (t). Awoman who can roll her tongue marries a man who cannot. Their firstchild has his father's phenotype. What are the genotypes of themother, father, and child? What is the probability that a secondchild will be a tongue roller?

3. A boy, whose parents and grandparents had normal vision is colorblind. What are the genotypes of his mother and his maternalgrandparents? (B = normal vision; bb = color blind)

4. The lubber grasshopper is a very large grasshopper, and is blackwith red and yellow stripes. Assume that red stripes are expressedfrom the homozygous RR genotype, yellow stripes from the homozygousrr genotype and both from the heterozygous Rr genotype. What willbe the phenotypic ration of the F1 generation resulting from across of two grasshoppers, both with red and yellow stripes (Rr xRr)? What would be the genotypic ration of the F1 generation? Whatphenotypes would be produced by crossing a grasshopper with bothcolor stripes and one with only yellow stripes?

5. Coat color in cats is a codominant trait and is also located onthe X chromosome. Cats can be black, yellow or calico. A calico cathas black and yellow splotches. In order to be calico, the cat musthave an allele for the black color and an allele for the yellowcolor. Use a punnet square to show why there are no male calicocats.

6. Consider an individual who has type O blood. Her brother hastype AB. Her fatherâs sister has type AB blood, and her fatherâsfather had a BB genotype. Her motherâs sister has type O blood, andher motherâs brother has type B blood. What are the genotypes ofher mother, father and her four grandparents?

scarletbadger875

Short answers please

1. What is the ultimate effect in an XY human with its SRY genemutated?

2. In humans, the allele for brown eye (B) is dominant to blue(b) eye color. If two heterozygous parents produce children, whatis the probability that:

a. The first child has brown eyes, and the next two childrenhave blue eyes?

b. If the couple above eventually produces a total of sixchildren, what is the probability that three of them will be boyswith brown eyes, and three of them girls with blue eyes?

3. In a paternity dispute, a type AB woman claimed that one ofthe four men was the father of her type A child. Which of thefollowing men could be the father of the child on the basis of theevidence below? Give your reasoning.

Man #1 = type A

Man #2 = type B

Man #3 = type O

Man #4 = type AB

4. Several mating were made among all-white cats. The progentfrom these mating showed the following phenotypic frequency:

All-white cats = 12/16

Black cats = 3/16

Gray cats = 1/16

a. Diagram the cross showing the genotypes of the parents, andtheir progeny as given above,

b. Which gene is epistatic? Explain your answer.

5. Mitosis and meiosis differ in that

a. homologues are seperated in prophase of mitosis

b. homologues are seperated in prophase I of meiosis

c. homologues are seperated in prophase II of meiosis

d. sister chromatids are seperated in prophase I of meiosis

6. The phases of meiosis that most resemble those of mitosisare

a. the meiosis I phase

b. the meiosis II phase

c. meiosis I, except for the pairing of homologues

d. meiosis II, except for the pairing of homologues

7. Genetic variability in sexually reproducing organism s arisesfrom

a. crossing over events between sister chromatids

b. crossing over events between nonsister chromatids

c. egg and sperm genetic recombination from distinctindividuals

d. egg and sperm recombination from an individual

8. A female contains an extra X chromosome, resulting fromnondisjunction. When this gamete is fertilized with normal sperm,it would result in an individual of a genotype

a. XXX

b. XXY

c. XYY

d. all of the above

e. only a and b

9. A diploid organism has the genotype AaBbCcDdEe. How manydifferent types of gametes can this individual produce?

a. 5

b. 10

c. 25

d. 32

e. 625

10. Assuming complete dominance, what is the phenotype ratio ofthe offspring of the cross AaBb x aabb?