In a three-point testcross, in the F2 generation: Select one: a. The parental, non-recombinant progeny are...
In a three-point testcross, in the F2 generation:
Select one:
a. The parental, non-recombinant progeny are the most frequently occurring
b. The double crossover progeny are the most frequently occurring
c. The single crossover progeny are the most frequently occurring
d. The parental, non-recombinant progeny are the least frequently occurring
e. A and B
Homework Answers
Option A
In a three point test cross, three types of progenies are formed -
Parental (non recombinants) = maximum in number
Single cross over (recombinants) = intermediate in number
Double cross over (recombinants) = least in number
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In a three-point testcross, in the F2 generation:
Select one:
a. The parental, non-recombinant progeny are...
In a three-point testcross, in the F1 generation: a. The parental, non-recombinant progeny are the most...
In a three-point testcross, in the F1 generation: a. The parental, non-recombinant progeny are the most frequently occurring b. The double crossover progeny are the most frequently occurring c. The single crossover progeny are the most frequently occurring d. The parental, non-recombinant progeny are the least frequently occurring e. All the progeny exhibit parental phenotypes
A double crossover is: a.) Less frequent than observing the parental, non-recombinant types b.) More frequent...
A double crossover is: a.) Less frequent than observing the parental, non-recombinant types b.) More frequent than observing the parental, non-recombinant types c.) More frequent than observing single crossover types d.) Less frequent than observing single crossover types e.) A and D f.) A and C
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Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called...
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I'm having trouble understanding this problem. The most frequent F2 progeny seem to have had crossover...
I'm having trouble understanding this problem. The most frequent
F2 progeny seem to have had crossover to me because the parents are
Aa Bb x aa bb but the progeny are Aa bb and aa Bb. I thought
parental progeny would have the same genotype as the parents. Can
you please explain how the most frequent progeny don't have
crossover? Thank you
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Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, r, and s, where tk is associated with thick wings, r is associated with round wings, and s is associated with sharp wings. He first crosses homozygous sharp birds to homozygous thick, round birds. Next, he testcrosses the F1 progeny to thick, round, sharp birds. He obtained the results shown. Given this data, label the progeny phenotypic classes as either parental, single crossover...
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Two peanut cultivars are crossed and their f1 progeny are selfed
to obtain an F2 generation. The first variety (represented in well
B) has a hairy stem. The second variety (represented in well C) has
a glabrous (hairless) stem. This trait is controlled by a single
gene, and hairy stems are completely dominant over hairless stems.
The DNA from both parents and the progeny is isolated, and a
portion of the gene controlling this trait is amplified using PCR
and...
F1 Testcross Progeny Phenotype Number 617 narrow Suppose a geneticist uses a three-point testcross to map three linked Drosophila recessive mutations called f, w, and n. Gene f is associated with abnormally fast movement, w is associated with a wavy movement pattern, and n is associated with narrow wings. 637 211 241 fast, wavy wavy fast, narrow fast wavy, narrow fast, wavy, narrow wild type 235 The geneticist first crosses homozygous narrow flies to homozygous fast, wavy flies. Next, he...
I'm having trouble understanding this problem. The most frequent
F2 progeny seem to have had crossover to me because the parents are
Aa Bb x aa bb but the progeny are Aa bb and aa Bb. I thought
parental progeny would have the same genotype as the parents. Can
you please explain how the most frequent progeny don't have
crossover? Thank you
In a dihybrid test cross the genotype of the F1 individual is Aa Bb and the tester genotype...
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