The gene for white eye colour is present on the X- chromosome in Drosophila, and is a recessive trait. A female fly with white eyes in the F1 generation can be produced if it inherits an X-chromosome with recessive allele from father only recessive allele from mother only recessive alleles from each parent dominant alleles from each parent

The gene for white eye colour is present on the X- chromosome in Drosophila, and is a recessive trait. A female fly with white eyes in the F1 generation can be produced if it inherits an X-chromosome with recessive allele from father only recessive allele from mother only recessive alleles from each parent dominant alleles from each parent

Name: The gene for white eye colour is present on the X-chromosome in Droso
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Description: The gene for white eye colour is present on the X-chromosome in Drosophila, and is a recessive trait.A female fly with white eyes in the F1 generationcan be produced if it inherits an X-chromosomewithrecessive allele from father onlyrecessive allele

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter14: Human Inheritance

Section: Chapter Questions

Problem 2GP: Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect...

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The gene for the production of eye colour in this species of fruit fly can be expressed aseither normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant tothat of brown, and is transmitted in normal Mendelian fashion.A gene involved with body colour in this species of fruit fly is located on the non-homologousportion of the X chromosome, and has two alleles, grey and yellow, where the grey allele isdominant to yellow.The two genes are NOT linked.a) Produce a key to clearly show the nature of the alleles associated with the eye colour inthis species of Drosophila, and in each case justify your choice of letters and / or style ofpresentation to best depict the genetics involved.
The production of eye-color pigment in Drosophila requires the dominant allele A. The dominant allele P of asecond independent gene turns the pigment to purple,but its recessive allele leaves it red. A fly producing nopigment has white eyes. Two pure lines were crossedwith the following results:P red-eyed female white-eyed maleF1 purple-eyed femalesred-eyed malesF1 F1purple eyed 38red eyed 38white eyed 28F both males and females: 2Explain this mode of inheritance, and show the genotypesof the parents, the F1, and the F2.
In Drosophila, the autosomal recessive brown eye color mutation displays interactions with the X-linked recessivevermilion mutation. Flies homozygous for brown and hemizygous or homozygous for vermilion have white eyes.Predict the F1 and F2 progeny of crossing these true-breeding parents: brown females and vermilion males.
The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product, embryogenesis isnot completed. Consider a cross between a female heterozygousfor the bicoid mutation (bcd+/ bcd-) and a homozygousmale(bcd-/ bcd-). How is it possible for a male homozygous for the mutationto exist?
In humans, one of the genes determining color vision islocated on the X chromosome. The dominant form (C )produces normal color vision; red-green color deficiency(c) is recessive. If a man with normal color visionmarries a color-deficient woman, what is the probabilityof them having a color-deficient son? A color-deficientdaughter?
A maternal effect gene in Drosophila, called torso, is found as afunctional allele (torso+) and a nonfunctional, recessive allele(torso−) that prevents the correct development of anterior- andposterior-most structures. A wild-type male (torso+ torso+) is crossedto a female of unknown genotype. This mating produces 100% larvathat are missing their anterior- and posterior-most structures andtherefore die during early development. What is the genotype andphenotype of the female fly in this cross? What are the genotypesand phenotypes of the female fly’s parents?
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…
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, males from a true-breeding stock withraspberry-colored eyes were mated to females from atrue-breeding stock with sable-colored bodies. In theF1 generation, all the females had wild-type eye andbody color, while all the males had wild-type eyecolor but sable-colored bodies. When F1 males andfemales were mated, the F2 generation was composedof 216 females with wild-type eyes and bodies, 223females with wild-type eyes and sable bodies, 191males with wild-type eyes and sable bodies, 188 maleswith raspberry eyes and wild-type bodies, 23 maleswith wild-type eyes and bodies, and 27 males withraspberry eyes and sable bodies. Explain these resultsby diagramming the crosses and calculating any relevant map distances
Mutations in DNA that result in altered proteins can causehereditary diseases. Pedigree studies and genetic testing mayclarify the risk of disease. At the chromosome level, nondisjunctionduring meiosis can result in gametes with too few or too manychromosomes, most of which produce inviable offspring.Imprinting refers to inactivation of alleles depending on whichparent the alleles come from; offspring in whom imprinting occursappear haploid for the affected gene even though they are diploid. During spermatogenesis, is there any difference in outcome between first- and second-division nondisjunction?
Female fruit flies homozygous for the X-linked white-eye alleleare crossed to males with red eyes. On very rare occasions, an offspringof such a cross is a male with red eyes. Assuming these rareoffspring are not due to a new mutation in one of the mother’s Xchromosomes that converted the white-eye allele into a red-eyeallele, explain how a red-eyed male arises.