Please EXPLAIN how you got the answer! A female animal with genotype A/a · B/b i
ID: 198899 • Letter: P
Question
Please EXPLAIN how you got the answer!
A female animal with genotype A/a · B/b is crossed with a double-recessive male (a/a · b/b) (test crossed). Their progeny include are shown in the following table.
A) The allele "A" and allele "B" in the female parent are transmitted in the same linkage group with cis configuration
B) The allele "A" and allele "B" in the female parent are transmitted and assorted independently.
C) The allele "A" and allele "B" in the female parent are transmitted in the same linkage group with the trans configuration
D) The allele "A" is dominant over the allele "B" in the female parent.
E) The allele "A" and allele "B" in the female parent are located at opposite ends of the chromosome
Please remember to reply if you can EXPLAIN how to do this problem. I'm super confused as to how to approach the answer.
2 4564 4445 //b BbbB A a, AExplanation / Answer
Answer: Choice A
Explanation: According to the information, it can be seen that the offsprings similar to female genotype and male genotype are maximum. This suggests that there is no recombination of the alleles. The fact that the final genotype ratio is not equal suggests that there is no independent assortment of genes. Finally, the fact that the maximum progeny bears genotype similar to male anf female genotypes suggests that the genrs are linker and inherited in cis manner i.e. without crossing over.