In parrots, annoying voices (A) are dominant to pleasant ones (a) and brightly colored feathers (B) are dominant to gray ones (b). You testcross a heterozygous annoying, brightly colored parrot and get 27 annoying, gray birds, 2 annoying bright birds, 30 pleasant bright birds, and 5 pleasant gray birds. What is the configuration of the two dominant parental alleles?
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- In cats, the allele (B) produces black color but (b) producesyellow color. These alleles are co‐dominant to each other. Aheterozygote produces a tortoise‐shell color. The alleles (B)and (b) are sex‐linked as well. Cross a tortoise‐shell femalewith a yellow male. What percent of their offspring will be yellow? What percent of their offspring will be black? What percent of their offspring will be tortoise shell?A wild-type fruit fly (heterozygous for gray body color andred eyes) is mated with a black fruit fly with purple eyes. Theoffspring are wild-type, 721; black purple, 751; gray purple, 49;black red, 45. What is the recombination frequency betweenthese genes for body color and eye color? Using informationfrom problem 3, what fruit flies (genotypes and phenotypes)would you mate to determine the order of the body color, wingsize, and eye color genes on the chromosome?In mice, tail shape (bent vs. straight) is controlled by alleles of one gene. You cross a mouse with a bent tail to a mouse with a straight tail. Half of the offspring have bent tails, half have straight tails (regardless of sex). What can you conclude? O Both mice are homozygous Bent is dominant to straight Both mice are heterozygous O One mouse is heterozygous, the other is homozygous O Straight is dominant to Bent
- In certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?Scurs in cattle is a sex-influenced trait. A cow with no scurs whosemother had scurs had offspring with a bull with scurs whose fatherhad no scurs. What are the probabilities of each of the followingcombinations of offspring? A. The first offspring will not have scurs.B. The first offspring will be a male with no scurs.C. The first three offspring will be females with no scursIn parrots, annoying voices (A) are dominant to pleasant ones (a) and brightly colored feathers (B) are dominant to gray ones (b). You testcross a dihybrid annoying, brightly colored parrot and get 2 annoying, gray birds, 27 annoying bright birds, 3 pleasant bright birds, and 25 pleasant gray birds. What is the configuration of the alleles? Group of answer choices 1)Both 2)Repulsion 3)Neither 4)Coupling
- In rabbits, black color (B) is dominant to brown (b), while fullcolor (C) is dominant to chinchilla (c ch). The genes controllingthese traits are linked. Rabbits that are heterozygous for bothtraits and express black, full color are crossed to rabbits thatexpress brown, chinchilla with the following results:31 brown, chinchilla 34 black, full16 brown, full 19 black, chinchillaDetermine the arrangement of alleles in the heterozygousparents and the map distance between the two genes.Height in humans is controlled by the additive action of genes and the action of environmental factors. For the purposes of this problem, assume that height is controlled by four genesA, B, C, and Dand that there are no environmental effects. Assume further that additive alleles contribute two units of height and partially additive alleles contribute one unit of height. a. Given these assumptions, can two individuals of moderate height produce offspring that are much taller and shorter than either parent? If so, how can this happen? b. Can someone of minimum height and someone of intermediate height have children taller than the parent of intermediate height? Why or why not?CAay Bew Scace In guinea pigs, rough coat is daminant (R) to smooth coat () and black coat (B) is dominant to white coat (b). A rough black guinea pig bred with a rough white one produces 29 rough black offspring, 31 rough white offspring, 11 smooth black and9 smooth white. Give the genotypes of the parents, the probability for the offspring, and the actual number of each kind of offspring you would expect. 9. Genatype of the rough, black parent? Genatype of the rough, white parent? Genotypes Phenotypes What is the probability of getting rxigh, black offspring? What is the probability of getting ough, white offspring? What is the probability of getting smooth, black offspring? What is the probability of getting smooth, white offspring? Of the 80 offspring that were produced, we might have expected how many of them to be rough and black? Of the B0 offspring that were produced, we might have expected how many of them to be rough and white? Of the 80 offspring that were produced, we might…
- A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an oddgait called dancing. The F1 animals all showednormal gait.a. If dancing is caused by homozygosity for the recessive allele of a single gene, what proportion ofthe F2 mice should be dancers?b. If mice must be homozygous for recessive allelesof each of two different genes to have the dancing phenotype, what proportion of the F2 shouldbe dancers if the two genes are unlinked?(Assume that all the mice in the populationwith normal gait were homozygous fordominant alleles.)c. When the F2 mice were obtained, 42 normal and8 dancers were seen. Use the chi-square test todetermine if these results better fit the one-genemodel from part (a) or the two-gene model frompart (b).chickens, comb shape is determined by alleles at twa loci (R. And P.) Walnut comb is produced w atan one dominant allele Is present at one locus and at least one dominant allele Pis present at a second locus Prototype. A rose comb is produced when at least one dominant allele is present at the first locus and two recessive alletes are present at the second locus (genotype: Rpp). A pea comb is produced when two recessive alleles are present at the first locus and at least one dominant allele is present at the second (genotypes wa recessive alleles are present at the first and at the second locus trap), a single comb is produced Progeny with what types of combs and in what proportions will result from the cross between Rp and PP 14 Walnut Pol 1/4 rose comb (Ppl. 1/4 Pea comb (rrPp), 1/4 single comb (rrpp) 16 walnut, 3/16 rosecomb (pp. 3/16 pea.comb (P X. 1/16 single comb (rrpp) O34 rose comb (R PP), 1/4 single comb rrpp) 12 walnut (RPp), 1/2 rose comb (Rpp). O pea (Pp). O single comb…In a population of a beetle species, you notice that thereis a 3:1 ratio of shiny to dull wing covers. Does this ratioprove that the shiny allele is dominant? (Assume thatthe two states are caused by two alleles of one gene.) Ifnot, what does it prove? How would you elucidate thesituation?