Biology - Principles of Inheritance and Variation Question with Solution | TestHub
Given below are two statements.
Statement I - Usually parental combinations occur more due to linkage and new combinations are due to crossing over.
Statement II - Crossing over occurs due to the interchanging and exchanging of corresponding segment between non-sister chromatids of homologous chromosomes.
In the light of above statements, select the correct option given below:
Options:
Answer:
Solution:
Linkage is the physical association of genes on a chromosome, which tends to keep the genes together during inheritance, resulting in a higher frequency of parental combinations. Crossing over is the process that breaks this linkage and creates new combinations (recombinants). Thus, Statement I is correct.
Crossing over is defined as the exchange of genetic material between non-sister chromatids of homologous chromosomes during the pachytene stage of prophase I of meiosis. This exchange of corresponding segments leads to genetic recombination. Thus, Statement II is also correct.
Both Statement I and Statement II are correct.
Answer: Both statement I and statement II are correct.
