Genetics problems

3. The urine of some people has a distinctive odor after eating asparagus. This appears to be a recessive trait. If a person with aromatic urine marries a person heterozygous for this trait, what phenotypic and genotypic ratios will their children theoretically exhibit? 4. Cat's tail has 42 chromosomes in each somatic cell. A. How many tetrads will be present at metaphase I of meiosis?

Genetics

In drosophila, gray body is dominant over ebony body color, while long wings are dominant over vestigial wings. work the following crosses through the f2 generation, and determine the genotypic and phenotypic ratios for each generation. assume that the p1 individuals are homozygous: a: gray, long X ebony, vestigial b: gray, vestigial X ebony, long c: gray, long X gray, vestigial

Predict the genotype and phenotype of the parents

given the inheritance pattern of the coat color in rats described in the previous problem, predict the genotype and phenotype of the parents that produced the following F1 offspring: (a) 9/16 gray:3/16 yellow:3/16 black:1/16 cream; (b) 9/16 gray:3/16 yellow:4/16 albino; (c) 27/64 gray:16/64 albino:9/64 yellow:9/64 black:3/64 cream Previous problem information: The following genotypes of two independently assorting autosomal genes determine coat color in rats: A-B- (gray); A-bb (yellow); aaB- (black); aabb (cream) A third gene pair on a separate autosome determines whether any color will be produced. The CC and Cc genotypes allow color according to the expression of the A and B alleles... click for more

What is the probability that their next child will be a female who has normal vision and is type O?

in humans, the ABO blood type is under the control of autosomal multiple alleles. Red-green color blindness is a recessive x-linked trait. If two parents who are both type A and have normal vision produce a son who is color-blind and type O, what is the probability that their next child will be a female who has normal vision and is type O?

What kinds of offspring would be expected from a cross of black male and a tortoiseshell female? What are the chances of getting a tortoiseshell male?

In cats, yellow coat color is determined by the b allele, and black coat color is determined by the B allele. The heterozygous condition results in a coat pattern known as tortoiseshell. These genes are x-linked. What kinds of offspring would be expected from a cross of black male and a tortoiseshell female? What are the chances of getting a tortoiseshell male?