Question

Mendel conducted ample reciprocal crosses to eliminate chance factor. Explain the statement.

Answer 1

Hint: The reciprocal cross is defined as the experiment of breeding in which the role of the parental sex is tested in the new inheritance organism. It is done by crossing the male of one stain and the female of the other. And this process is repeated by making the reciprocal of the stains.

Complete Answer:
Steps involved in reciprocal cross:
- In the first cross, the traits that express the male are made to cross with a female trait that does not express itself.
- In the second cross, a female expressing the trait of interest will be crossed with a male trait that does not express itself.
- In order to find whether it is inherited or not, a hypothetical allele Z and a different of some gene A, is on the male or female sex chromosome is considered.
- In the first step, crossing was done between a Z-trait female and an A-trait male and observing the result of the obtained offspring.
- Next, an A-trait female is crossed with a Z-trait male and the offspring obtained is observed
through the principles of dominant and recessive alleles, an conclusion was made as to which sex chromosome containing the gene Z is resembled.

Note: This process of ample reciprocal crosses is done to know whether the alleles are available on sex chromosomes or autosomes by eliminating the effect of cytoplasmic chromosomes. Corresponding crosses also provided the same results even after changing the expressed gene and thus he concluded the sex has no influence in the expressing of the dominance of the particular trait.