You are doing a genetics experiment with Drosophlia melanogaster, the fruit fly. In the "P" generation, you cross 2 true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All the flies in the F1 generation are brown and have normal wings. Assume that the genes are not found on sex chromosomes. Indicate color alleles as "B" for brown, "b" for black, "W" for normal wings, "w" for wingless. (A) What are the genotypes in the P generation? (B) What are the genotypes of the flies in the F1 generation?

You are doing a genetics experiment with Drosophlia melanogaster, the fruit fly. In the "P" generation, you cross 2 true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All the flies in the F1 generation are brown and have normal wings. Assume that the genes are not found on sex chromosomes. Indicate color alleles as "B" for brown, "b" for black, "W" for normal wings, "w" for wingless. (A) What are the genotypes in the P generation? (B) What are the genotypes of the flies in the F1 generation?

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Description: You are doing a genetics experiment with Drosophlia melanogaster, the fruitfly. In the "P" generation, you cross 2 true-breeding flies. The female parentis brown and wingless and the male parent is black with normal wings. Allthe flies in the F1 gen

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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You are doing a genetics experiment with Drosophlia melanogaster, the fruit fly. In the "P" generation, you cross 2 true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All the flies in the F1 generation are brown and have normal wings. Assume that the genes are not found on sex chromosomes. Indicate color alleles as "B" for brown, "b" for black, "W" for normal wings, "w" for wingless.
You are doing a genetics experiment with the fruit fly. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. Assume the genes are not found on a sex chromosome. Indicate the body color alleles with B and b and the wing size alleles with N and n. a) The genotypes of the flies in the P generation are: Female: ______________ Male: ______________ b) The genotype of the flies in the F1 generation is: _____________ c) You now take an F1 female and cross her to a true-breeding black, wingless male. This male’s genotype is: ______________
Vestigial wing is a recessive autosomal mutation in the fruit fly Drosophila melanogaster. Wild-type flies have red eyes, but another mutation, an X-linked recessive mutation causes white eyes. You cross a parental generation of males with vestigial wings with females that have white eyes. 1) What phenotypic ratio would you expect in the F1 generation from such a cross? What phenotypes do you observe in these flies? (e.g. males with red eyes and wild-type wings). 2) What phenotypic ratio would you expect in the F2 generation? What phenotypes do you observe in these flies?
In Drosophila, the vestigial wings recessive allele,vg, causes the wings to be very small. A geneticistcrossed some true-breeding wild-type males to some vestigial virgin females. The male and female F1 flieswere wild type. He then allowed the F1 flies to matewith one another and found that 1/4 of the male andfemale F2 flies had vestigial wings. He dumped thevestigial F2 flies into a morgue and allowed the wildtype F2 flies to mate and produce an F3 generation.a. Give the genotype and allele frequencies amongthe wild-type F2 flies.b. What will be the frequencies of wild-type andvestigial flies in the F3?c. Assuming the geneticist repeated the selection againstthe vestigial F3 flies (that is, he dumped them in amorgue and allowed the wild-type F3 flies to mate atrandom), what will be the frequency of the wild-typeand mutant alleles in the F4 generation?d. Now the geneticist lets all of the F4 flies mate atrandom (that is, both wild-type and vestigial fliesmate). What will be the…
In Drosophila flies, the allele b gives a black body, and the allele b+ gives brown, the wild-typephenotype. The allele wx of a separate gene gives waxy wings, and wx+ gives non-waxy. The allele cn ofa third gene gives cinnabar eyes, and cn+ gives red. A female heterozygous for these three genes istestcrossed, and 745 progenies are produced which are phenotypically classified as follows:5 b+ wx+ cn+4 b wx cn53 b+ wx cn 49 b wx+ cn+287 b+ wx+ cn279 b wx cn+ 33 b+ wx cn+35 b wx+ cn Make a linkage map of the three genes. Compute for interference and explain what the derived valuemeans. Show complete solutions to support your answers.
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
Two pure-breeding strains of flies are mated, and the F1 are intercrossed. The first strain has curled wings and black bodies. The second strain has straight wings and brown bodies. The F2 progeny are 271 straight wings with brown bodies, 31 curled wings with black bodies, 94 curled wings with brown bodies and 90 straight wings with black bodies. If instead of the above, assume the wing shape gene and the body color gene are completely linked. From parents that are curled winged with brown bodies mated to straight winged with black bodies, what would be the outcome of an F1 intercross? (Specify the phenotypes and the frequency of each expected).
The Drosophila chromosome 4 is extremely small;virtually no recombination occurs between genes onthis chromosome. You have available three differentlymarked chromosome 4s: one has a recessive allele ofthe gene eyeless (ey), causing very small eyes; one hasa recessive allele of the cubitus interruptus (ci) gene,which causes disruptions in the veins on the wings;and the third carries recessive alleles of both genes.Drosophila adults can survive with two or three, butnot with one or four, copies of chromosome 4.a. How could you use these three chromosomes tofind Drosophila mutants with defective meiosescausing an elevated rate of nondisjunction?b. Would your technique allow you to discriminatenondisjunction occurring during the first meioticdivision from nondisjunction occurring during thesecond meiotic division?
The Drosophila chromosome 4 is extremely small;virtually no recombination occurs between genes onthis chromosome. You have available three differentlymarked chromosome 4s: one has a recessive allele ofthe gene eyeless (ey), causing very small eyes; one hasa recessive allele of the cubitus interruptus (ci) gene,which causes disruptions in the veins on the wings;and the third carries recessive alleles of both genes.Drosophila adults can survive with two or three, butnot with one or four, copies of chromosome 4.a. How could you use these three chromosomes tofind Drosophila mutants with defective meiosescausing an elevated rate of nondisjunction?b. Would your technique allow you to discriminatenondisjunction occurring during the first meioticdivision from nondisjunction occurring during thesecond meiotic division?c. What progeny types would you expect if a flyrecognizably formed from a gamete produced bynondisjunction were testcrossed to a fly homozygous for a chromosome 4 carrying both ey…
An individual comes into your genetics clinic to be tested for any anomalies. When looking at their karyotype, you notice they have three X chromosomes and a Y chromosome. What information would you be able to relay to this individual? O They have Turner syndrome, are genetically female, and have two Barr bodies per cell. O They have Klinefelter syndrome, are genetically female, and have two Barr bodies per cell. O They have Klinefelter syndrome, are genetically male, and have two Barr bodies per cell. O They have Klinefelter syndrome, are genetically male, and have three Barr bodies per cell. O They have Turner syndrome, are genetically male, and have three Barr bodies per cell.
You ave established a mutant line of flies with a balancer chromosome. The balancer chromosome includes GFP and a mutation in gene X that causes flies to be sterile in the homozygous state. The recessive mutation that you are studying is in gene Y, and causes flies to develop two tail ends in the homozygous state. This mutation is lethal in the homozygous state. For each of the following phenotypes in the balanced mutant line, what alleles are present and in how many copies? a.) Glows green, fertile (Select] b.) Glows green, sterile [Select) c.) does not glow green, two tails (Select] If you crossed a fly from your balanced line with the following flies, what proportion of the offspring would glow green and be fertile? d.) wild-type [Select ) e.) fly with balancer chromosome from parental generation [ Select ]
In a fungus with four ascospores, a mutant allele lys-5causes the ascospores bearing that allele to be white,whereas the wild-type allele lys-5+ results in black ascospores. (Ascospores are the spores that constitute thefour products of meiosis.) Draw an ascus from each ofthe following crosses:a. lys-5 × lys-5+b. lys-5 × lys-5c. lys-5+ × lys-5+