To determine the recombination frequency of two linked genes, what genotypes of organisms are crossed?O Amy cross between two individuals will yield the same resultsO A homarygous dominant individual with a homozvgos recesshveO A heterozygous individual with a homozypous dominant individualO A heterozygous individual with a homozygous recessive individualO Two heterorygous individuals

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Description: To determine the recombination frequency of two linked genes, what genotypes of organisms are crossed?O Amy cross between two individuals will yield the same resultsO A homarygous dominant individual with a homozvgos recesshveO A heterozygous indivi

Genes are heredity units present on the chromosome and are meant to transfer genetic instructions .…

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To determine the recombination frequency of two linked genes, what genotypes of organisms are crossed? O Amy cross betwnen two individuals will yield the same results O A homarygous dominant individual with a homazygous recessive O A heterouygous individual with a homozypous daminant individual O A heterozygous individual with a homozygous recessive individual O Two heterarygous individuals

To determine the recombination frequency of two linked genes, what genotypes of organisms are crossed? O Amy cross betwnen two individuals will yield the same results O A homarygous dominant individual with a homazygous recessive O A heterouygous individual with a homozypous daminant individual O A heterozygous individual with a homozygous recessive individual O Two heterarygous individuals

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter3: Transmission Of Genes From Generation To Generation

Section: Chapter Questions

Problem 18QP: More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible...

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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?
Albino rabbits (lacking pigment) are homozygous forthe recessive c allele (C allows pigment formation).Rabbits homozygous for the recessive b allele makebrown pigment, while those with at least one copy ofB make black pigment. True-breeding brown rabbitswere crossed to albinos, which were also BB. F1 rabbits, which were all black, were crossed to the doublerecessive (bb cc). The progeny obtained were 34black, 66 brown, and 100 albino.a. What phenotypic proportions would have beenexpected if the b and c loci were unlinked?b. How far apart are the two loci?
Which of the following statements about crossover is FALSE? Crossover between homologous chromosomes would lead to a reshuffling of alleles. Crossover between sister chromatids would lead to a reshuffling of alleles. O Crossover between non-sister chromatids would lead to a reshuffling of alleles. O Frequent crossover between linked genes that are far apart on the chromosome may lead to 50% recombinant frequency. O Crossover occurs at higher frequency between linked genes that are further apart than those that are close to each other.
More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handed
In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?
. In 1919, Calvin Bridges began studying an X-linkedrecessive mutation causing eosin-colored eyes inDrosophila. Within an otherwise true-breedingculture of eosin-eyed flies, he noticed rare variantsthat had much lighter cream-colored eyes. By intercrossing these variants, he was able to make a truebreeding cream-eyed stock. Bridges now crossedmales from this cream-eyed stock with true-breedingwild-type females. All the F1 progeny had red (wildtype) eyes. When F1 flies were intercrossed, the F2progeny were 104 females with red eyes, 52 maleswith red eyes, 44 males with eosin eyes, and14 males with cream eyes. Assume that thesenumbers represent an 8:4:3:1 ratio.a. Formulate a hypothesis to explain the F1 and F2results, assigning phenotypes to all possiblegenotypes.b. What do you predict in the F1 and F2 generations if the parental cross is between truebreeding eosin-eyed males and true-breedingcream-eyed females?c. What do you predict in the F1 and F2 generationsif the parental cross is…
Considering a pair ofhomologous chromosomescontaining a gene having twodifferent alleles how manydifferent genotypes can theindividual present?
In a dihybrid cross of two heterozygous individuals, you expect a 9:3:3:1 phenotypic ratio in the offspring, but observe a ratio of 9:7. What is the most likely explanation? O Codominance O It is a sex-limited trait O Simple Mendelian inheritance O Incomplete penetrance O Epistatic interaction of the two genes
In the hybridization of 2genes (4 different alleles, 2 ofeach pair) how does epistasisaffect the proportion ofphenotypical forms in the F2generation?
The XG locus on the human X chromosome has twoalleles, XG+ and XG. The XG+ allele causes the presence of the Xg surface antigen on red blood cells,while the recessive XG allele does not allow antigento appear. The XG locus is 10 m.u. from the STSlocus. The STS+ allele produces normal activity ofthe enzyme steroid sulfatase, while the recessive STSallele results in the lack of steroid sulfatase activityand the disease ichthyosis (scaly skin). A man withichthyosis and no Xg antigen has a normal daughterwith Xg antigen. This daughter is expecting a child.a. If the child is a son, what is the probability he willlack Xg antigen and have ichthyosis?b. What is the probability that a son would have boththe antigen and ichthyosis?c. If the child is a son with ichthyosis, what is theprobability he will have Xg antigen?
Explain the rationale behind a testcross. Is it necessary for one ofthe parents to be homozygous recessive for the genes of interest?In the heterozygous parent of a testcross, must all of the dominantalleles be linked on the same chromosome and all of the recessivealleles be linked on the homolog?
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+