The inheritance of short wings in Drosophila iruit nles is an X- IIhked, recessive trait. Which would most likely result ifa short-winged female mates with a long-winged male? O A Half of the males and females will be short-winged, and half will be long-winged. B. All offspring will be short-winged. O C. All females will be long-winged, and all males will be short-winged. O D. All females will be short-winged, and all males will be long-winged.
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- ch of the following best describes why males cannot be carriers of sex-linked traits? A. Males cannot be carriers because their Y chromosome makes them immune to sex-linked traits B. This is incorrect, males can be carriers of sex-linked traits O C. Males cannot be carriers because they only inherit one X chromosome, either having the trait or not O D. Males cannot be carriers because their mothers pass on an X chromosome without the sex-linked traitSuppose that a gene affects the anterior morphology in house flies andis inherited as a maternal effect gene. The gene exists in a functionalallele, H, and a recessive nonfunctional allele, h, which causes a smallhead. A female fly with a normal head is mated to a true-breedingmale with a small head. All of the offspring have small heads. Whatare the genotypes of the mother and offspring? Explain your answer. A dark female moth is crossed with a dark male. All themale progeny are dark, but half the female progeny arelight and the rest are dark. Propose an explanation forthis pattern of inheritance.
- в IUA Callbri 12 3 4 12. In Drosophila, gray body color is dominant over ebony body color, while long wings are dominant over vestigial wings. Work the following crosses through the F2 generation, and determine the genotypic and phenotypic ratios for each generation. Assume that the P1 individuals are homozygous. a. Gray, long x ebony, vestigial b. Gray, long x gray, vestigial !! !! lili 田Part 1= You are to discover the chromosomal location (autosomal or X linked) and mode of inheritance for two new fly mutations couchpotato (cp) and happyhour (hh) The homozygous couchpotato (cpcp) phenotype is (sedentary) an extreme lack of activity The homozygous happyhour (hhhh) can drink any other fly under the table so phenotype (drinker) PARENTS Cross Male double homozygous mutants cp hh with Female wild wild CP HH are to be crossed BUT FIRST you don’t know if either gene is on the X chromosome Parental diploid genotypes could be: male cpcphhhh female CPCPHHHH if Both genes autosomal or Male XcpYhhhh female XCPXCPHHHH if cp on the X chromosome and hh autosomal or Male cpcpXhhY female CPCPXHHXHH if hh on the X chromosome and cp autosomal What are the female and male PARENTAL GAMETE GENOTYPES for the above parental crosses if: a) Both genes were autosomal ((REMEMBER BOTH GENDER HAVE ONE GAMETE GENO) b) cp gene on the X chromosome and hh autosomal…In certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?
- in humans, the development of gonadal sex in females is determined by a. The production of inductors by xx cells D. Inductors act on the medulla region of undifferentiated gonads The production of inductors by xy cells d. A and b С. е. B and c Consider the following cross in Drosophila: Tra tra xx crossed with tra tra xy What are the genotypes and frequencies in the offspring? Application question. a. 1/2 Tra tra xx 2 Tra tra xy 1/4 tra tra xx 1/2 Tra tra xy 1/4Tra tra xy b. 1/4 Tra tra xx 1/4 tra tra xy 1/4 Tra tra xx 1/4 tra tra xx C. d. 1/4 Tra Tra xx 1/4 Tra Tra xy 1/4 tra tra Xx 1/4 tra tra xy е. None of these WORK SPACE for Number 19When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation includedboth red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation forthis result? a. The gene involved is on the X chromosomeb. The gene involved is on the Y chromosomec. The gene involved is on an autosome, but only in malesd. Other male-specific factors influence eye color in fruit fliese. None of these is correctThe inheritance in short wings in Drosophila fruit flies is an x-linked trait, recessive. Which would most likely result if a short-winged female mates with a long- winged male?
- 0. In Drosophila, the gene for cinnabar eye color is onchromosome 2, and the gene for scarlet eye color is onchromosome 3. A fly homozygous for both recessivecinnabar and scarlet alleles (cn/cn; st/st) is white-eyed.a. If male flies (containing chromosomes with thenormal gene order) heterozygous for cn and st allelesare crossed to white-eyed females homozygous forthe cn and st alleles, what are the expected phenotypes and their frequencies in the progeny?b. One unusual male heterozygous for cn and st alleles,when crossed to a white-eyed female, produced onlywild-type and white-eyed progeny. Explain the likelychromosomal constitution of this male.c. When the wild-type F1 females from the cross withthe unusual male were backcrossed to normal cn/cn;st/st males, the following results were obtained:wild type 45%cinnabar 5%scarlet 5%white 45%Diagram a genetic event at metaphase I that couldproduce the rare cinnabar or scarlet flies among theprogeny of the wild-type F1 females.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…What explains how the parents in a family both have the same eye color, but some of their children have a different eye color? Assume for this example that eye color is determined by a single gene. ● One parent is homozygous dominant, and the other homozygous recessive for a gene that controls eye color allowing some of the children to express a different trait. O The parents are both heterozygous for a gene that controls eye color allowing some of the children to get two recessive alleles. O The parents are both homozygous dominant for a gene that controls eye color allowing some of the children to get two recessive alleles. O One parent is homozygous dominant, and the other heterozygous for a gene that controls eye color allowing some of the children to express a different trait.