Crossing over is the exchange of genetic material between two homologous
chromosomes. Crossing over is also an enzyme-mediated process and the enzyme
involved is called recombinase. Crossing over leads to recombination of genetic
material on the two chromosomes.
a. Name the phase of prophase-I where crossing over occurs?
b. What is the importance of crossing over in meiosis ?
c. Which chromosome are involved in crossing over ?
Answers
Explanation:
a. Diplotene. In the fourth phase of prophase I, diplotene (from the Greek for "twofold"), crossing-over is completed. Homologous chromosomes retain a full set of genetic information; however, the homologous chromosomes are now of mixed maternal and paternal descent.
b. Crossing over is essential for the normal segregation of chromosomes during meiosis. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical.
c. Crossing over occurs between prophase I and metaphase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.
BRAINLIEST ANSWER PLEASE MARK