A number of true-breeding brown dogs were crossed with a true-breeding white breed. All the pups were brown. When several of the F1's were allowed to breed, the F2's were 92 brown, 58 black and 10 white. Provide a genetic explanation for these results and show the genotypes of the two original parents.
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- A breeder performed a testcross to find out if his male dog was a purebred black. He got one brown puppy and seven black puppies, did he have the purebred? (explain) What was the genotype of the female dog he used in test cross (BB), (Bb), or (bb)? (explain)When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon examination, it can be seen that the coat of a roan cow consists of both red and white hairs. What were the original parental genotypes?Erma and Harvey were a compatible barnyard pair, but a curioussight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm.Their F1 piglet offspring all grew tails that were 18 cm. Wheninbred, an F2 generation resulted in many piglets (Erma andHarvey’s grandpigs), whose tails ranged in 4-cm intervals from6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails,while 1/64 had 6-cm tails and 1/64 had 30-cm tails. Que: Explain how these tail lengths were inherited by describingthe mode of inheritance, indicating how many gene pairswere at work, and designating the genotypes of Harvey,Erma, and their 18-cm-tail offspring.
- Erma and Harvey were a compatible barnyard pair, but a curioussight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm.Their F1 piglet offspring all grew tails that were 18 cm. Wheninbred, an F2 generation resulted in many piglets (Erma andHarvey’s grandpigs), whose tails ranged in 4-cm intervals from6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails,while 1/64 had 6-cm tails and 1/64 had 30-cm tails. Que: If one of the 18-cm F1 pigs is mated with one of the 6-cmF2 pigs, what phenotypic ratio would be predicted if manyoffspring resulted? Diagram the cross.In a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive. If a test-cross is performed and 1000 plants are coiunted, approximately how many plants will have white flowers?Guinea pigs have coats that are either rough or smooth. Rough coats are dominant, so they are represented by (R), and smooth coats are recessive, so they are represented by (r). If we crossed a homozygous rough-coated guinea pig with a smooth-coated guinea pig, what are the phenotypic and genotypic ratios?
- Two organisms are both true-breeding for different forms of a trait: one shows a dominant phenotype, and the other shows a recessive phenotype. If these two organisms are crossed, the resulting offspring will show what proportions of phenotypes?Duroc Jersey pigs are typically red, but a sandy variation is alsoseen. When two different varieties of true-breeding sandy pigswere crossed to each other, they produced F1 offspring that werered. When these F1 offspring were crossed to each other, they produced red, sandy, and white pigs in a 9:6:1 ratio. Explain this pattern of inheritance.. In 1919, Calvin Bridges began studying an X-linkedrecessive mutation causing eosin-colored eyes inDrosophila. Within an otherwise true-breedingculture of eosin-eyed flies, he noticed rare variantsthat had much lighter cream-colored eyes. By intercrossing these variants, he was able to make a truebreeding cream-eyed stock. Bridges now crossedmales from this cream-eyed stock with true-breedingwild-type females. All the F1 progeny had red (wildtype) eyes. When F1 flies were intercrossed, the F2progeny were 104 females with red eyes, 52 maleswith red eyes, 44 males with eosin eyes, and14 males with cream eyes. Assume that thesenumbers represent an 8:4:3:1 ratio.a. Formulate a hypothesis to explain the F1 and F2results, assigning phenotypes to all possiblegenotypes.b. What do you predict in the F1 and F2 generations if the parental cross is between truebreeding eosin-eyed males and true-breedingcream-eyed females?c. What do you predict in the F1 and F2 generationsif the parental cross is…
- A dark-red strain and a white strain of wheat are crossed andproduce an intermediate, medium-red F1. When the F1 plants areinterbred, an F2 generation is produced in a ratio of 1 dark-red:4 medium-dark-red: 6 medium-red: 4 light-red: 1 white. Furthercrosses reveal that the dark-red and white F2 plants are truebreeding. How many additive alleles are needed to produce each possiblephenotype?Professor John decided to breed bunnies during stay-at-home because why not. She performed the following cross:Parents:brown fur, gray nose x white fur, gray noseOffspring:3/8 white fur, gray nose1/8 white fur, white nose3/8 brown fur, gray nose 1/8 brown fur, white noseBased on the phenotypes of the offspring, what are the genotypes of the parents? Make sure you define your genotypes (ie B is brown fur, b is white fur)Three babies were born in a hospital on the same night, and their blood groups were later found to beO, B, and AB. Complete the Punnett square to cross parents AB x O (using the alleles IA, IB, and i) todetermine the blood type possibilities their off-springs would have. Use the Punnett square informationto determine which baby belongs to them