Question
Biology Question on Principles of Inheritance and Variation
Crossing over in diploid organism is responsible for
A
segregation of alleles
B
recombination of linked alleles
C
dominance of genes
D
linkage between genes.
Answer
recombination of linked alleles
Explanation
Solution
Crossing over is the reciprocal exchange of segments between nonsister chromatids of a pair of homologous chromosomes. It results in recombination of genes. The nonsister chromatids in which exchange of segments takes place are known as cross-overs or recombinants while othe- chromatids not involved in exchange of segments are called noncross-over or parental types. Single crossing-over at one point between two nonsister chromatids resulting in two cross-over and two parental types. Double crossing over at two points in a tetrad of chromatids.