Heterozygous black (Bb) guinea pigs are mated to homozygous recessive (bb) whites. Predict the genotypic and phenotypic ratios expected from backcrossing the black F1 progeny to (a) the black parent, (b) the white parent
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Heterozygous black (Bb) guinea pigs are mated to homozygous recessive (bb) whites. Predict the
genotypic and
black parent, (b) the white parent
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- You are working with a hypothetical fly and have found color and wing mutants. Preliminary work indicates that the mutant traits are recessive and the associated genes are not sex-linked, but beyond that, you have no information. You first look at 2 genes, each with 2 alleles. "B" or “b" for body color and "W" or "w" for wing surface. The red-body phenotype is dominant to the yellow-body phenotype and smooth wings are dominant to crinkled wings.Assume that in horses, black coat colour is dominant (B) to chestnut colour (b). The troting gait is due to a dominat allele (T), and the pacing gait is a recessive allele (t) a) If two Black trotting horses are mated and have for offsprings, all of which are black and pacing, what does that reveal about the probable genotype of the parent horses? b)A stud is black and trotting. He is mated with a mayor who is also black and trotting. Their colt is black and pacing. The same stud is mated to a second mare who is Chestnut and pacing. Their colt is Chestnut and trotting. What is the probable genotype(s) of the stud, mare 1, colt 1, and colt 2In 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?An AABB zebra fish is crossed with an aabb zebra fish. (A) is the dominant allele and (a) is the recessive allele of an autosomal gene. Similar relations exist between (B) and (b) alleles of another fish autosomal gene, at a different locus. The F1 are crossed with a homozygote recessive. a)What will be the results of the testcross and the progeny ratios if genes A and B are completely linked? b)What will the results of the testcross be if the loci assort independently? c) What will the results of the testcross be if the loci are linked with a certain recombination (crossing over) frequency?In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated? (c) Two different matings were made between black members of the F2 generation, with the following results. Cross Offspring Cross 1 All black Cross 2 3/4 black, 1/4 white Diagram each of the crosses.
- Two goats are mated together. One is tall and brown and of unknown genotype. The other is a short white goat. Assuming that tall (T) is dominant to short (t) and Brown (B) is dominant to white(b), what is the probability that they will produce a short, white offspring?For Dalmatian dogs, the spotted condition is dominant over non-spotted. (a) Using a Punnett square, show the results of a cross between two heterozygous parents. ( please draw the punnet square and write the parent and G and f1: thanks) (b) A spotted female Dalmatian dog mates with an unknown father. From the appearance of the pups, the owner concludes that the male was a Dalmatian. The owner notes that the female had six pups, three spotted and three non-spotted. What are the genotype and phenotype of the unknown male?In cattle, the gene for hornless (H) is dominant to the gene for horned (h), the gene for black (B) is dominant to that of red (b), and the gene for white face, or Hereford spotting, (S) is dominant to that for solid color (s). A cow (female) that is heterozygous for all traits is inseminated by a bull (male) of the genotype bbhhSs. What is the probability of obtaining a calf that is a black, hornless bull with Hereford spotting?
- Heterozygous Cp cp chickens express a condition called creeper, in which the leg and wing bones are shorter than normal (cp cp). The dominant Cp allele is lethal when homozygous. Two alleles of an independently segregating gene determine white (W-) versus yellow (ww) skin color. From matings between chickens heterozygous for both of these genes, what phenotypic classes will be represented among the viable progeny and what are their expected relative frequencies?A male black (BB) and polled (PP) Angus is crossed with a female black (BB) and horned (pp) Angus. a) Give the phenotypic and genotypic ratio of their F1 offspring. b) If the F1 in is inter se mated, what are the possible phenotypic and genotypic ratios of their offspring?Carrion beetles lay their eggs in dead animals and then bury them in the ground until they hatch. Assume that the preference for fresh meat (F) is dominant to the preference for rotted meat and that the tendency to bury the meat shallow (S) is dominant to the tendency to bury the meat deep. Suppose a female carrion beetle homozygous dominant for both traits mates with a male homozygous recessive for both traits. 1) What will the F1 genotypic ratio be? 2) What are the chances of obtaining a beetle that is heterozygous for both traits?