Which of the following statement is true? O Recombinants can be formed by crossovers during meiosis II Recombinant frequencies lower than 50% are diagnostic for linkage. O Recombinant frequencies higher than 25% are indications of no linkage. Recombinants of linked genes can be formed in the absence of crossover. Recombinants cannot be formed without crossovers during meinsis I

Which of the following statement is true? O Recombinants can be formed by crossovers during meiosis II Recombinant frequencies lower than 50% are diagnostic for linkage. O Recombinant frequencies higher than 25% are indications of no linkage. Recombinants of linked genes can be formed in the absence of crossover. Recombinants cannot be formed without crossovers during meinsis I

Name: Which of the following statement is true?Recombinants can be formed b
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Description: Which of the following statement is true?Recombinants can be formed by crossovers during meiosis IIORecombinant frequencies lower than 50% are diagnostic for linkage.O Recombinant frequencies higher than 25% are indications of no linkage.O Recombina

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations

Section: Chapter Questions

Problem 19QP: The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the...

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The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the duration of meiosis in females, speculate on the possible reasons for females contributing aneuploid gametes more frequently than males do.
Indicate whether to cross (i) mutant females with wild-type males, or (ii) mutant males with wild-type females, or (iii) both (i.e. reciprocal crosses), to produce an F1 generation that will enable you to determine if the traits are dominant or recessive, and if they are sex-linked (on the X chromosome). Draw mating diagrams and Punnett squares to support your answer. To determine whether the mutant genes are independent or linked, a testcross is more appropriate than using data from the F2 generation. Knowing which are the recessive genes, indicate which individuals you would mate in this testcross. Draw a mating diagram & use the forked line method to predict the outcome of this cross. Conduct the appropriate testcross using Drosophila Lab, record your results and indicate whether the three mutant genes are inherited independently or whether they are linked? Include a chi square analysis to support your conclusion.
Two genes ‘d’ and ‘t’ are assumed to show linkage as well as produce recombinants upto 30%. If dd/ dd individual is crossed with one which is tt/tt. What genotype will produce in first filial generation? Also give the possible meiotic products produced by first generation. If a test cross is performed what phenotypes and genotypes will produced in progeny.
Three genes yellow (y) white (w) and cut (ct) are under investigation for possible linkage on the X chromosome. Pure breeding yellow body/white eye/normal wing female flies are crossed with pure breeding black body/red eye/cut wing males. The females in the F1 are black/red/normal, the males are all yellow/white/normal.The F2 males and females are crossed, but ONLY the male flies are are scored (see table). Phenotype Male offspring y + ct 9 + w + 6 y w ct 90 + + + 95 + + ct 424 y w + 376 A. Is the gene order as written (y-w-ct) the same as the gene order on the chromosome? B.What is the mapping distance between yellow and white? C.What is the between cut and white? D.What is the mapping distance between yellow and cut?
An individual that is homozygous AABBcc is crossed to an individual that is homozygous aabbCC producing F1 individuals with genotype AaBbCc. Assume that the A, B, and C loci are all on the same chromosome. One chromatid at the start of meiosis (before crossing over) has the alleles A, B, and c. What alleles are on its sister chromatid? What alleles are on the homolog? Group of answer choices A. Sister chromatid ABc, Homolog no way to tell B. Sister chromatid ABC, Homolog abc C. Sister chromatid ABc, Homolog abC D. Sister chromatid abC, Homolog ABc
A fruit fly of genotype B R/b r is testcrossed with b r/b r.In 84 percent of the meioses, there are no chiasmata between the linked genes; in 16 percent of the meioses,there is one chiasma between the genes. What proportion of the progeny will be B r/b r?
Two parents of the same heterozygous genotype are involved in a tetrahybrid cross. Their genotypes are FfGgHhIi. Assuming independent assortment of these four genes, what are the probabilities that F1 offspring will have the following genotypes? a) ffgghhii b) FfGgHhIi c) FFGGHHII d) FfGGhhIi e) FfGGHHii
Sex-reversed females with XY were found to be missing SRY gene on their Y chromosomes, while sex-reversed males with XX were found to carry a portion of a Y chromosome that has the SRY gene. What can you conclude from these two cases? 1.Sex determination depends primarily on the combination of sex chromosomes and the presence of SRY gene. 2.X and Y chromosomes can’t pair up during meiosis because they are not true homologous chromosomes. 3.Nonreciprocal crossover could result in translocation of the SRY gene between X and Y chromosome. 4. The SRY gene has a key role to determine maleness. 5.The Y chromosome contains a gene that determine maleness.
Three autosomal genes are linked along the same chromosome.The distance between gene A and B is 7 mu, the distance betweenB and C is 11 mu, and the distance between A and C is 4 mu. Anindividual that is AA bb CC was crossed to an individual that is aaBB cc to produce heterozygous F1 offspring. The F1 offspring werethen crossed to homozygous aa bb cc individuals to produce F2offspring.Where would a crossover have to occur to produce an F2 offspringthat was heterozygous for all three genes?
In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings (vgvg). The genes are located on the same chromosome. A pure-breeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with normal wings. All of the F1 progeny had a WT phenotype. The recombination frequency between the two genes is 15%. If an F1 individual were test crossed, what percentage of the progeny would you expect to have the WT phenotype?
With regard to linked genes on the same chromosome, whichof the following statements is false?a. Crossing over is needed to produce nonrecombinant offspring.b. Crossing over is needed to produce recombinant offspring.c. Crossing over is more likely to separate alleles if they arefar apart on the same chromosome.d. Crossing over that separates linked alleles occurs duringprophase of meiosis I.
When crossover occurs within an inversion (in an individual that is heterozygous for the inversion) the resulting gametes could ________. Group of answer choices be polyploid have deletions, but not duplications have deletions and duplications be aneuploid none of these is correct