Homework Answers
2. The possible phenotypes are AB, ab parental and Ab,aB recombinant. The distance between A and B is 10 cM indicates that recombinant phenotype would be 10 percent and parent phenotype would be 90 percent . There are two parental phenotypes which indicates ab would be 45percent( half of 90)
3. 80cM indicates 80 percent recombinant implies 20 percent parental. So ab would be 10 percent( half of 20).
4.It will be the same since the phenotype would be AB,aB,Ab,ab.
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Please help with Q2-4
2. If A and B are 10 CM apart, what proportion of...
genes A and B are 20 map units apart. If you cross Ab/aB xab/ab, how many...
genes A and B are 20 map units apart. If you cross Ab/aB xab/ab, how many each progeny type would you expect if total progeny was 1000. a. AaBb(AB/ab) b. Aabb ( Ab/ab) c. aaBb(aB/ab) d. aabb(ab/ab) is b and c the parental ? would that mean that b and c are 20 ? Thanks
Question 12 0.5 pts The a and b loci are 40 CM apart. An AABB individual...
Question 12 0.5 pts The a and b loci are 40 CM apart. An AABB individual mates with an aabb individual. What gametes will the F1 individual of this cross produce and in what proportions? AB 20% Ab 30% aB 30% ab 20% AB 30% Ab 20% aB 20% ab 30% AB 60% Ab 40% aB 40% ab 60% AB 25% Ab 25% aB 25% ab 25% Question 13 0.5 pts The a and b loci are 58 CM apart....
Genes A and B are located on the same chromosome 10 centimorgans apart. What is the...
Genes A and B are located on the same chromosome 10 centimorgans apart. What is the likelihood of AB/ab progeny in a cross between Ab/aB and ab/ab individuals? a. 1/20 b. 1/10 c. 1/4 d. 9/20 e. 9/10
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the...
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the following results: Phenotype AB 22 Ab 28 ab 29 ab 21100 total (for the purposes of this quiz, do not combine parental and recombinant classes) You wish to test the hypothesis that the data are best explained as a dihybrid test cross AaBb x aabb. 1)For a chi-square test, what expected number would you use for the aB class? 2)Calculate the chi-square value for...
Question 2 Genes a and b are linked, with 20% recombination frequency. Two pure breeding strains...
Question 2 Genes a and b are linked, with 20% recombination frequency. Two pure breeding strains (the parental cross) were crossed. The F1 was then testcrossed. a+b-/a-b+ x a-b-/a-b- What were the parental strains genotypes? b. What would be the genotypes and the probability of each, among progeny of the testcross? Example: a+b+/a-b- 45% c. Is this an example of cis- or trans-linkage?
43. Genes a and b are X-linked and are located 7 mu apart on the X...
43. Genes a and b are X-linked and are located 7 mu apart on the X chromosome of Drosophila. A female of genotype a+ b/a b+ is mated with a wild-type (a+b+/Y). a. What is the probability that one of her sons will be either a+b+ or a b+ in phenotype? b. What is the probability that one of her daughters will be a+b+ in phenotype? 44. Three recessive autosomal mutations in Drosophila: a versus wild-type A. b versus B,...
2. You carry out a dihybrid cross in sweet peas where you examine the flower color...
2. You carry out a dihybrid cross in sweet peas where you examine the flower color locus (use symbols based on "P" for this gene) and blooming time locus (use symbols based on "L" for this gene). You cross a true breeding purple- flowering, early blooming plant to a true breeding red-flowering, late blooming plant. The F1 plants are all purple- flowering and late blooming. The F1 plants were subsequently used in a testcross. The flower color locus and the...
Please help with a through d. Much appreciated! The following example illustrates how both principles of...
Please help with a through d. Much appreciated!
The following example illustrates how both principles of probability can be combined to solve problems in genetics. Probability can also be a useful tool in predicting the results of dihybrid and trihybrid matings For example, in mating AaBb x AaBb, one would expect 1/4 of the progeny to be AA, 2/4 Aa, and 1/4 aa, or 3/4 A- to 1/4 aa. Likewise, 1/4 should be BB, 2/4 Bb, and 1/4 bb, or...
The genes A/a and B/b are 20 cM apart. In a cross AB/ab x ab/ab, which...
The genes A/a and B/b are 20 cM apart. In a cross AB/ab x ab/ab, which genotypes do you expect in the offspring, and with which frequencies? What are the expected gamete frequencies for an AB/ab individual? For an Ab/aB individual?
4. In the genetic study of the color of the hull in oat seeds, it was...
4. In the genetic study of the color of the hull in oat seeds, it was determined that genes A and B control this phenotype. Individuals with a dominant A allele display the black hull phenotype whereas individuals with the recessive a alleles and the dominant B allele have a gray hull and individuals with recessive a and b genes have white hulls. a) What genetic phenomenon best describes this inheritance pattern? b) Two individuals are crossed: Aabbx AaBb. What...
Question 12 0.5 pts The a and b loci are 40 CM apart. An AABB individual mates with an aabb individual. What gametes will the F1 individual of this cross produce and in what proportions? AB 20% Ab 30% aB 30% ab 20% AB 30% Ab 20% aB 20% ab 30% AB 60% Ab 40% aB 40% ab 60% AB 25% Ab 25% aB 25% ab 25% Question 13 0.5 pts The a and b loci are 58 CM apart....
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the following results: Phenotype AB 22 Ab 28 ab 29 ab 21100 total (for the purposes of this quiz, do not combine parental and recombinant classes) You wish to test the hypothesis that the data are best explained as a dihybrid test cross AaBb x aabb. 1)For a chi-square test, what expected number would you use for the aB class? 2)Calculate the chi-square value for...
43. Genes a and b are X-linked and are located 7 mu apart on the X chromosome of Drosophila. A female of genotype a+ b/a b+ is mated with a wild-type (a+b+/Y). a. What is the probability that one of her sons will be either a+b+ or a b+ in phenotype? b. What is the probability that one of her daughters will be a+b+ in phenotype? 44. Three recessive autosomal mutations in Drosophila: a versus wild-type A. b versus B,...
2. You carry out a dihybrid cross in sweet peas where you examine the flower color locus (use symbols based on "P" for this gene) and blooming time locus (use symbols based on "L" for this gene). You cross a true breeding purple- flowering, early blooming plant to a true breeding red-flowering, late blooming plant. The F1 plants are all purple- flowering and late blooming. The F1 plants were subsequently used in a testcross. The flower color locus and the...
Please help with a through d. Much appreciated!
The following example illustrates how both principles of probability can be combined to solve problems in genetics. Probability can also be a useful tool in predicting the results of dihybrid and trihybrid matings For example, in mating AaBb x AaBb, one would expect 1/4 of the progeny to be AA, 2/4 Aa, and 1/4 aa, or 3/4 A- to 1/4 aa. Likewise, 1/4 should be BB, 2/4 Bb, and 1/4 bb, or...
4. In the genetic study of the color of the hull in oat seeds, it was determined that genes A and B control this phenotype. Individuals with a dominant A allele display the black hull phenotype whereas individuals with the recessive a alleles and the dominant B allele have a gray hull and individuals with recessive a and b genes have white hulls. a) What genetic phenomenon best describes this inheritance pattern? b) Two individuals are crossed: Aabbx AaBb. What...
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