In a diploid plant species, an F₁ with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are as follows:

What is the interference value for this data set?

Question

In a diploid plant species, an F₁ with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are as follows:

Table displaying offspring genotypes and their corresponding numbers from a genetic test cross in a diploid plant species.

What is the interference value for this data set?

Accepted Answer

Hey, everyone. Let's take a look at this question together in Drosophila, sepia eyes, curled wings and ebony body are encoded by recessive genes found on chromosome three. A researcher crosses S E C U E plus plus plus females with S E C U E S E C U E males and obtains the following progeny data. The frequency of crossing over is 22%. 4 genes S E and C U and 16.6% or genes C U and E determine the interference value for this data set. Is it answer choice. A zero answer choice, B 0.29 answer choice C 0.33 or answer choice D 0.64. Let's work this problem out together to try to figure out which of the following answer choices represents the interference value for this data set. So we are trying to determine the interference value which we know that interference can be calculated by one minus the coefficient of confidence. And we note that the coefficient of confidence is calculated as the observed number of double rec competence divided by the expected number of those double recombinant. And so in order to solve this question, we first must calculate the observed number of double recombinant and the expected number of double recombinant. And so, looking at the progeny data, we have to determine the number of offspring that have the alleles of the parents, the number of offspring with recombinant of genes C U N E recombinant of genes S E N C U as well as our double crossover rec competence. And so our parents are the ones that have the parent genotypes, which we know are represented as 340 offspring and offspring with a total of 640. Our recombinant of C U and E are represented as having 60 plus 80 offspring, which gives us a total of 140. And our recombinant of S E and C U are represented as 100 and 10 And 84, which gives us a total of 194. And lastly, our double crossover recombinant, which is represented as 10 and 16, giving us a total of 26. And so our observed values of double recombinant is 26. And our expected value can be calculated by that 22% or genes S E and C U and that 16.6% or gene C U and E. So we multiply 0.22 by 0.166. And we multiply that by 1000, which gives us 36.52. And so our observed value is 26 and our expected value is 36.52, which means that our coefficient of confidence equals divided by 36.52 which equals 0.71. And our interference which is calculated as one minus the coefficient of confidence. So we have one minus our coefficient of confidence, which is 0.71. And it gives us our interference value of 0.29 which means that answer choice B 0.29 is the correct answer. Because our coefficient of confidence, which is that observed number of double recombinant divided by the expected number, which our observed number is 26. Since we have 26 double crossover recombinant. And our expected value Which is 0.22 multiplied by 0.166, multiplied by 1000 is 36.52. So 26 divided by 36.52 equals 0.71. And we subtract that from one which gives us 0.29. So answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

In a diploid plant species, an F₁ with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are as follows:

What is the interference value for this data set?

Verified video answer for a similar problem:

Key Concepts

Test Cross

Interference

Genotype Frequencies

In a diploid plant species, an F₁ with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are as follows: What is the interference value for this data set?

Verified video answer for a similar problem:

Key Concepts

Test Cross

Interference

Genotype Frequencies

In a diploid plant species, an F₁ with the genotype Gg Ll Tt is test-crossed to a pure-breeding recessive plant with the genotype gg ll tt. The offspring genotypes are as follows:

What is the interference value for this data set?