For the Auricorus Blue-tailed Fly, that lives on the planet Trumpor, there are several recessive genes...

For the Auricorus Blue-tailed Fly, that lives on the planet Trumpor, there are several recessive genes that are all on the same autosome. In the following problems, a true breeding female fly that shows three distinct disease (gene) phenotypes is crossed to a wild-type male fly. An F1 female fly is then test-crossed to a true-breeding male fly showing all three disease phenotypes. Given the data below, what are the recombination fractions among all three loci?

Gene A Phenotype: Muppeteritus eye color

Gene B Phenotype: Farfeggnuggen wing shape

Gene C Phenotype: Farfeggnuggen wing angle

Table of Phenotype Counts
ABC 395
AB+ 51
A+C 6
A++ 46
+BC 59
+B+ 5
++C 45
+++ 405

A. A-B: 0.176 ; B-C: 0.30
B. A-B: 0.211 ; B-C: 0.145
C. A-B: 0.115 ; B-C: 0.106
D. A-B: 0.154 ; B-C: 0.111
E. A-B: 0.054 ; B-C: 0.288

Expert Solution

Ans:

C. A-B: 0.115 B-C: 0.106

Explanation: The genotypes which are most frequent is called parental genotypes. So, ABC and +++ are parental genotypes. The genotypes which are less frequent is known as double crossover genotypes. So, A+C and +B+ are the double crossover genotypes. The calculated recombination fraction between gene A and B is 0.115 and gene B and C is 0.106.

All the calculation is given below-

All other options are incorrect because the calculated recombination fraction between A and B is 0.115 and B and C is 0.106.

gladiator answered 2 years ago

What is the difference between dominant and recessive genes

A female fruit fly with the recessive mutant phenotype of white eyes and miniature wings is...

A female fruit fly with the recessive mutant phenotype of white eyes and miniature wings is mated with a male possessing the wild-type phenotype of red eyes and normal wings. Among the F1s, all the females are wild-type while all the males exhibit the mutant phenotype. The F2s resulting from a test cross exhibit predominantly (63%) parental phenotypes. How do you explain these results?

On the island of Bilago, on the Planet Ceti Alpha 6, there lives a population of...

On the island of Bilago, on the Planet Ceti Alpha 6, there lives a population of armadiles (cross between an armadillo and a crocodile). A portion of these armadiles have small teeth; as a result, they are vegetarian. About 15% of vegetarians on the planet are amradiles. Tooth size is determined by a single autosomal locus with two alleles: T (trait allele) and t (wild type allele). In a recent study, researchers collected the values in the following table: Table...

A Drosophila female homozygous mutant for two recessive genes (a and b) is crossed to a...

A Drosophila female homozygous mutant for two recessive genes (a and b) is crossed to a wild-type male. The F1 are all wild-type. An F1 female is crossed to a double-mutant male and the following phenotypes were seen in the F2: a b 497 + + 460 a + 465 + b 426 Total 1848 Perform a “best fit” or apriori χ2 analysis to determine if genes a and b assort independently. Give the value for χ2, DF and Probability;...

Thalassemia is a recessive blood disease caused by reduced synthesis of one of the globin genes....

Thalassemia is a recessive blood disease caused by reduced synthesis of one of the globin genes. While SCD is a mutation in the structure of hemoglobin, thalassemias can also be caused by mutations in the regulatory elements, causing too little globin to be produced and resulting in anemia. You've designed a DNA probe that you want to use to screen a family for a rare mutation in the β-globin gene that causes thalassemia. First you will use the probe for...

Three recessive genes in dogs are linked on a chromosome. A dog heterozygous for all three...

Three recessive genes in dogs are linked on a chromosome. A dog heterozygous for all three recessive alleles is crossed with homozygous for all the recessive alleles in a three-point testcross. (a) Determine the order of these genes on the chromosome and (b) calculate the map distances between the genes. The progeny of the testcross are: r T W 324 R t w 319 R t W 880 r T w 887 R T W 2376 r t w 2365 r t W 47 R T w 41 Total 7,239

4) In fruit fly (Drosophila melanogaster), grayish eye color and wingless bodies are caused by recessive...

4) In fruit fly (Drosophila melanogaster), grayish eye color and wingless bodies are caused by recessive genes located on different chromosomes. Red eyes (gr+) and normal wings (wl+) are dominant to gray eyes (gr) and wingless (wl), respectively. Suppose that a true-breeding male with gray eyes and normal wings is crossed with a true-breeding female with red eyes and wingless. a) What is the genotype and phenotype of the F1? b) If these F1 individuals were allowed to intermate, what...

You are studying the inheritance of three genes in the scorpion fly Panorpa communis. You have...

You are studying the inheritance of three genes in the scorpion fly Panorpa communis. You have identified three different autosomal recessive traits, lavender eyes, green body and pointed wings. These phenotypes are caused by alleles in thee different genes, x, y, and z respectively. Wild type flies have red eyes, brown body, and straight wings (x+, y+ and z+). You cross two different pure breeding and obtain a wild-type F1. You then cross the F1 to a true-breeding line that...

10] You are studying the inheritance of three genes in the scorpion fly Panorpa communis. You...

10] You are studying the inheritance of three genes in the scorpion fly Panorpa communis. You have identified three different autosomal recessive traits, lavender eyes, green body and pointed wings. These phenotypes are caused by alleles in thee different genes, x, y, and z respectively. Wild type flies have red eyes, brown body, and straight wings (x+, y+ and z+). You cross two different pure breeding and obtain a wild-type F1. You then cross the F1 to a true-breeding line...

Genetics: A geneticist is studying two genes. Each gene can be either dominant or recessive. A...

Genetics: A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample of 100 individuals is categorized as follows. Write your answer as a fraction or a decimal, rounded to four decimal places. Gene 2 Dominant Recessive Gene 1 Dominant 57 20 Recessive 14 9 Send data to Excel (a) What is the probability that in a randomly sampled individual, gene 1 is dominant? (b) What is the probability that in a randomly sampled individual,...

Question