Fur color is determined by two loci, A and B, in minks. Two brown mink mate and produce a large litter of baby minks with the following phenotypic ratios: 12/16 brown; 3/16 black; and 1/16 white. What is the genotype of the black progeny? O A. A_ B_ O B. A B_ and A_ bb O C. aa bb O D. aa B_ E. A BB
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- Two alleles of gene C control hair color in horses: C¹and C². Horses homozygous for allele C¹ are red, heterozygotes are yellow, and C² homozygotes are cream. What type of allele interaction is described? A) pleiotropy B) complete dominance C) incomplete dominance D) recessive lethality E) codominance - What if F2 ratio would be expected from the F1 mating of two heterozygous with this allelic interaction? A) 3:1 B) 9:3:3:1 C) 9:7 D) 1:2:1There are two alleles for the height gene, T for tall and t for short. One parent is a heterozygote, while the other is a recessive homozygotes. Which genotypes, and at which frequencies, are possible from these two parents. a.) 100% heterozygotes b.) 100% dominant homozygotes c.) 50% dominant homozygotes, 50% recessive homozygotes d.) 50% dominant homozygotes, 50% heterozygotes e.) 50% heterozygotes, 50% recessive homozygotes f.) 25% dominant homozygotes, 50% heterozygotes, 25% recessive homozygotes g.) 100% recessive homozygotesIn Border Collies, black coat (B) is dominant to red coat (b). A breeder has a black male that has won numerous awards.T he breeder would like to use the dog for breeding if he is purebred (BB). To learn this information, she testcrosses him with a red female (bb). a) If the black male is BB, what kind of gamete (sperm) can he produce? b) If the red female is bb, what kind of gamete (eggs) can she produce? c) If the black male is Bb, what kind(s) of gametes (sperm) can he produce? d) If any of the puppies are red, what is the father's genotype?
- In cats, the allele for black fur (B) is dominant over the allele for brown fur (b). A heterozygous female cat mated with a homozygous recessive male cat.a. What is the genotype of the female cat?b. What is the phenotype of the female cat?e. Draw a Punnett square to show what kinds of kittens these two cats could make. What fraction of the kittens would you expect to have each genotype?Based on the allelic gene interaction in Australian milking shorthorn cattle breeds, the mating of a red cattle (RR) and white cattle is depicted in the picture below. What is gene interaction involved in this resulting coat color of the offspring? see photo attached a. Complete dominance b. Incomplete dominance c. Codominance d. Additive gene actionIn African clawed toads, albino skin (a) is recessive to green skin (A). Two toads are mated. One of the parents has green skin and one has albino skin. Among the resulting offspring are twenty albinos and eighteen greens. (Show your work below!) (a) What is the genotype of the green parent? (b) What is the genotype of the albino parent? (c) What are the genotypes of the offspring? Greens Albinos (d) Did segregation of alleles occur? (e) Did independent assortment of alleles occur? (f) Explain your answers. (g) Which of Mendel’s Laws is demonstrated by this example?
- The allele for red feather color in pigeons (B), is dominant to the allele for brown feathers (b.) A red pigeon that has a red parent and a brown parent is mated with a brown pigeon. a.) Give the genotypes of the two pigeons being mated. b.) what proportion of the F1 progeny would be expected to have brown feathers? Assume that these pigeons produce five young pigeons. c.) what is the probability that all five will be red? d.) What is the probability that 3 will be red and 2 will be brown?In cats, the allele (B) produces black color but (b) produces a yellow color. These alleles are incompletely dominant to each other. A heterozygote produces a tortoiseshell color. The alleles (B) and (b) are sex-linked as well Cross a tortoiseshell female with a yellow male. a. What percent of their offspring will be yellow? b.What percent of their offspring will be black? c.What percent of their offspring will be tortoiseshell? d.Why is it impossible to have a tortoiseshell male offspring?In fruit flies, curved wings are recessive to straight wings, and ebonybody is recessive to gray body. A cross was made between truebreeding flies with curved wings and gray bodies and flies withstraight wings and ebony bodies. The F1 offspring were then mated toflies with curved wings and ebony bodies to produce an F2 generation.A. Diagram the genotypes of this cross, starting with the parentalgeneration and ending with the F2 generation.B. What are the predicted phenotypic ratios of the F2 generation?C. Let’s suppose the following data were obtained for the F2 generation:114 curved wings, ebony body105 curved wings, gray body 111 straight wings, gray body114 straight wings, ebony bodyConduct a chi square analysis to determine if the experimental dataare consistent with the expected outcome based on Mendel’s laws.
- If an organism has two different alleles (call the alleles a andb) of a gene,a. its phenotype will be the same as an organism with twoidentical alleles of this gene.b. all of its gametes will contain both the a allele and theb allele.c. it is homozygous for that gene.d. it is heterozygous for that gene.A tall pea plant with purple flowers (both determined by dominant alleles) is crossed with a short plant with white flowers. there is no linkage of genes. if the tall, purple-flowered plant is heterozygous for both traits, the offspring will be: A 1 purple tall:1 white short B 3 purple tall:1 white short C 9 purple tall:3 purple short:3 white tall:1 white short D 1 purple tall:1 purple short:1 white tall:1 white shortA 1:2:1 genotype ratio underlies the 3:1 phenotype ratio in the F2. The purple allele is designated A while the white allele is designated a. What are the genotypes of the 1:2:1 ratio? a. Aa:aa:AA b. AA:aa:Aa c. aa:Aa:AA d. a:AA:Aa e. AA:Aa:aa