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Q1: Assuming these two genes sort independently, how many progeny would you expect to show the green striped phenotype? (Enter your answers as a whole number, e.g. 1)
Q2:
Which of the following are recombinant
A. Green and Spotted
B. Green and Striped
C. Yellow and Spotted:
D. Yellow and Striped
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Solved in 2 steps
- When Calvin Bridges observed a large number of offspring from a cross of white-eyed female Drosophila tored-eyed males, he found very rare white-eyed femalesand red-eyed males among the offspring. He was ableto show that these exceptions resulted from nondisjunction, such that the white-eyed females had received twoXs from the egg and a Y from the sperm, while thered-eyed males had received no sex chromosome fromthe egg and an X from the sperm. What progeny wouldhave arisen from these same kinds of nondisjunctionalevents if they had occurred in the male parent? Whatwould their eye colors have been?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?While conducting field studies on a chain of islands, you decide tokaryotype two phenotypically identical groups of turtles, which arefound on different islands. The turtles on one island have 24 chromosomes,but those on another island have 48 chromosomes. Howwould you explain this observation? How do you think the turtleswith 48 chromosomes came into being? If you crossed the twotypes of turtles, would you expect the offspring to be phenotypicallynormal? Would you expect them to be fertile? Explain.
- On a camping trip, you find one male snail on a desertedisland that coils to the right. However, in this same area, youfind several shells (not containing living snails) that coil tothe left. Therefore, you conclude that you are not certain ofthe genotype of this male snail. On a different island, you finda large colony of snails of the same species. All of these snailscoil to the right, and every snail shell that you find on thissecond island coils to the right. With regard to the maternaleffect gene that determines coiling pattern, how would youdetermine the genotype of the male snail that you found onthe deserted island? In your answer, describe your expectedresultsSuppose that unicorns have one gene that codes for color, where S is silver and s is white. The unicorns also have another gene that codes for tail color, where P is purple and p is pink.If these two genes are unlinked, what is the probability that a cross between Ss Pp × Ss pp parents will produce two out of eight offspring that are white with pink tail?Let’s suppose that a gene affecting pigmentation is found on the Xchromosome (in mammals or insects) or the Z chromosome (inbirds) but not on the Y or W chromosome. It is found on an autosome in bees. This gene exists in two alleles: D (dark) is dominant tod (light). What would be the phenotypic results of crosses betweentrue-breeding dark females and true-breeding light males and of thereciprocal crosses involving true-breeding light females and truebreeding dark males for each of the following species?A. Birds C. BeesB. Fruit flies D. Humans
- In Drosophila, a cross was made between a yellowbodied male with vestigial (not fully developed)wings and a wild-type female (brown body). The F1generation consisted of wild-type males and wild-typefemales. F1 males and females were crossed, and theF2 progeny consisted of 16 yellow-bodied males withvestigial wings, 48 yellow-bodied males with normalwings, 15 males with brown bodies and vestigialwings, 49 wild-type males, 31 brown-bodied femaleswith vestigial wings, and 97 wild-type females.Explain the inheritance of the two genes in questionbased on these results.Based on the ideas proposed by Morgan, which of the followingstatements concerning linkage is not true?a. Traits determined by genes located on the same chromosome arelikely to be inherited together.b. Crossing over between homologous chromosomes can create newallele combinations.c. A crossover is more likely to occur in a region between two genesthat are close together than in a region between two genes that arefarther apart.d. The probability of crossing over depends on the distance betweenthe genes.e. Genes that tend to be transmitted together are physically located onthe same chromosomeIncomplete dominance and epistasis are both terms thatdefine genetic relationships. What is the most basicdistinction between these terms?
- In a vial of Drosophila, a research student noticedseveral female flies (but no male flies) with bag wingseach consisting of a large, liquid-filled blister insteadof the usual smooth wing blade. When bag-wingedfemales were crossed with wild-type males, 1/3 of theprogeny were bag-winged females, 1/3 were normalwinged females, and 1/3 were normal-winged males.Explain these results.Most of the feathers of erminette fowl are light colored, with an occasional black one, giving a fleckedappearance. A cross of two erminettes produced a totalof 48 progeny, consisting of 22 erminettes, 14 blacks,and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test yourhypotheses?In a cross between two varieties of corn, gl1gl1Ws3Ws3(eggparent) x Gl1Gl1ws3ws3 (pollen parent), a triploid offspringwas produced with the genetic constitution Gl1Gl1gl1Ws3ws3ws3.From which parent, egg or pollen, did the 2n gamete originate? Isanother explanation possible? Explain.