When two loci are partially linked, the offspring observed in a dihybrid cross in the F2...
When two loci are partially linked, the offspring observed in a dihybrid cross in the F2 are:
a. all the recombinant types b. all the parental types c. 50% of recombinant, and parental types d. 25% of recombinant types, and 75% parental types e. None of the above
Homework Answers
Answer will be D option
25% parental type while 75%are recombinant when gene are partially linked
As total 8 gamete formed out of which 2 are parental type while 6 are recombinant type.
Hope it's ok.. thanks
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When two loci are partially linked, the offspring observed in a
dihybrid cross in the F2...
When two loci are unlinked, the offspring observed in a dihybrid cross in the F2 are:...
When two loci are unlinked, the offspring observed in a dihybrid cross in the F2 are: a.) all the recombinant types b.) all the parental types c.) 50% of recombinant, and 50% parental types d.) 25% of recombinant types, and 75% parental types e. None of the above
When two loci are completely linked, the offspring observed in a dihybrid testcross in the F2...
When two loci are completely linked, the offspring observed in a dihybrid testcross in the F2 are: a.) all the recombinant types b.) all the parental types c.) 50% of recombinant, and parental types d.) 25% of recombinant types, and 75% parental types e.) None of the above
The results for the F2 progeny are shown for a F1 cross using the two X-linked...
The results for the F2 progeny are shown for a F1 cross using
the two X-linked markers:
w+ and m+.
As shown in the figure, the F1 cross is between the following
two parents:
- a phenotypically wild-type (red eye, full wing), heterozygous
female: w+m+/wm
- a double mutant male (white eye, miniature wing):
wm/Y
Answer the following questions:
1) In the F1 cross, can you infer the genotype for the phenotype
in the female? Why or why not?
2)...
Genes ‘‘a’’ and ‘’b’’ are linked with a recombination frequency of 10%. “A” is completely dominan...
Genes ‘‘a’’ and ‘’b’’ are linked with a recombination frequency of 10%. “A” is completely dominant over ‘’a’’ and ‘’B’’ is completely dominant of ‘’b’’. Assuming you start with the following parental genotypes AAbb and aaBB in a dihybrid cross Indicate the percentage of F2 progeny following an F1 self-cross that have: only parental types, both parental and recombinant types and only recombinant types. a. 90%, 10% 0% b. 45%, 45%, 10% c. 85%, 10%, 5% d. 81%, 18%, 1%...
In a cross involving independently assorting loci, the cross BBYY x bbyy (assume "B" and "Y"...
In a cross involving independently assorting loci, the cross BBYY x bbyy (assume "B" and "Y" are dominant to "b" and "y," respectively) will yield all dihybrid offspring. When those offpspring are crossed, the result is usually a 9:3:3:1 phenotypic ratio. But what if the locus "B" and "Y" did not sort independently (i.e., they were linked, at least partially)? It would mean "BY" and "by" are now more likely. How would this specifically affect the expected 9:3:3:1 ratio? To...
The following cross was carried out: BBdd x bbDD and all of the F1 offspring had...
The following cross was carried out: BBdd x bbDD and all of the F1 offspring had the genotype BbDd. A) What are the possible gametes that these F1 offspring could produce? Put a circle around each type of gamete to make clear the alleles present in that gamete. B) If one of these F1 offspring is subjected to a testcross, which offspring genotypes would be considered recombinant and which offspring genotypes would be considered non-recombinant (parental). Make sure to indicate...
In a cross involving independently assorting loci, the cross BBYY x bbyy (assume "B" and "Y"...
In a cross involving independently assorting loci, the cross BBYY x bbyy (assume "B" and "Y" are dominant to "b" and "y," respectively) will yield all dihybrid offspring. When those offpspring are crossed, the result is usually a 9:3:3:1 phenotypic ratio. But what if the locus "B" and "Y" did not sort independently (i.e., they were linked, at least partially)? It would mean "BY" and "by" are now more likely. How would this specifically affect the expected 9:3:3:1 ratio? To...
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...
In a newly isolated strain of fruit flies with normal viability of offspring, two linked loci...
In a newly isolated strain of fruit flies with normal viability of offspring, two linked loci map much closer than in other strains. This could be due to the fact that the new strain is a. homozygous for an inversion b. heterozygous for an inversion c. homozygous for a reciprocal translocation d. heterozygous for a reciprocal translocation e. Homozygous for a duplication
In a newly isolated strain of fruit flies with normal viability of offspring, two linked loci...
In a newly isolated strain of fruit flies with normal viability of offspring, two linked loci map much closer than in other strains. This could be due to the fact that the new strain is a. homozygous for an inversion b. heterozygous for an inversion c. homozygous for a reciprocal translocation d. heterozygous for a reciprocal translocation e. Homozygous for a duplication
The results for the F2 progeny are shown for a F1 cross using
the two X-linked markers:
w+ and m+.
As shown in the figure, the F1 cross is between the following
two parents:
- a phenotypically wild-type (red eye, full wing), heterozygous
female: w+m+/wm
- a double mutant male (white eye, miniature wing):
wm/Y
Answer the following questions:
1) In the F1 cross, can you infer the genotype for the phenotype
in the female? Why or why not?
2)...
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...
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