1/2 In hamsters, black hair is dominar 9. black hair (BB) is crossed with a white remar phenotypic ratios of their offspring? If they to be black? Key Parents: B
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A: Black is dominant over white.
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Q: INCOMPLETE DOMINANCE A red carnation plant is crossed with a yellow carnation plant. What is the…
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A: Dominance is the expression of one allele of a gene in heterozygous genotype. The recessive…
Q: In hamsters, black hair is dominant over white hair. A male hamster homozygous for 9. black hair…
A: Answer: Monohybrid cross is the cross between trait of same organism.
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A: From the monohybrid cross, Mendel’s law of segregation was given. According to this law, when two…
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A: Incomplete dominance is a state in which, heterozygous state produces the trait which is mixture…
Q: In guinea pigs, black hair (B) is dominant to brown hair (b) and short hair (H) is dominant to long…
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- A pedigree analysis was performed on the family of a man with schizophrenia. Based on the known concordance statistics, would his MZ twin be at high risk for the disease? Would the twins risk decrease if he were raised in an environment different from that of his schizophrenic brother?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?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?
- Two mothers give birth to sons at the same time at a busy urbanhospital. The son of mother 1 has hemophilia, a disease causedby an X-linked recessive allele. Neither parent has the disease.Mother 2 has a son without hemophilia, despite the fact thatthe father has hemophilia. Several years later, couple 1 suesthe hospital, claiming that these two newborns were swappedin the nursery following their birth. As a genetic counselor, youare called to testify. What information can you provide the juryconcerning the allegation?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?When many families were tested for the ability to tastethe chemical phenylthiocarbamide, the matings weregrouped into three types and the progeny were totaled,with the results shown below:ChildrenNumber NonParents of families Tasters tastersTaster × taster 425 929 130Taster × nontaster 289 483 278Nontaster × nontaster 86 5 218With the assumption that PTC tasting is dominant (P)and nontasting is recessive (p), how can the progenyratios in each of the three types of mating be accountedfor?
- In guinea pigs, short hair (L) is dominant to long hair (l), and the heterozygous conditions ofyellow coat (CY) and white coat (CW) give cream coat. A short- haired, cream guinea pig is bredto a long-haired, white guinea pig, and a long-haired, cream baby guinea pig is produced. Whenthe baby grows up, it is bred back to the short-haired, cream parent. What phenotypic classes, andin what proportions, are expected among the offspring?Three coat-color patterns that occur in some breeds of horses aretermed cremello (beige), chestnut (brown), and palomino (goldenwith light mane and tail). If two palomino horses are mated, theyproduce about 1/4 cremello, 1/4 chestnut, and 1/2 palomino offspring. In contrast, cremello horses and chestnut horses breed true.(In other words, two cremello horses will produce only cremellooffspring, and two chestnut horses will produce only chestnut offspring.) Explain this pattern of inheritance.Two genes control color in corn snakes as follows:O– B– snakes are brown, O– bb are orange, oo B– areblack, and oo bb are albino. An orange snake wasmated to a black snake, and a large number of F1progeny were obtained, all of which were brown.When the F1 snakes were mated to one another, theyproduced 100 brown offspring, 25 orange, 22 black,and 13 albino.a. What are the genotypes of the F1 snakes?b. What proportions of the different colors wouldhave been expected among the F2 snakes if the twoloci assort independently?
- 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?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.In Shorthorn cattle, coat color is controlled by a single gene thatcan exist as a red allele (R) or a white allele (r). The heterozygotes (Rr) have a color called roan that looks less red than theRR homozygotes. However, when examined carefully, the roanphenotype in cattle is actually due to a mixture of completelyred hairs and completely white hairs. Should this be calledincomplete dominance, codominance, or something else?Explain your reasoning
