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a
The first two subphases of prophase-I are relatively short-lived as compared to pachytene
b
Bivalent chromosomes clearly appear as tetrads during zygotene
c
Crossing-over is enzyme-less mediated process
d
Crossing-over is the exchange of sister chromatids of homologous pairs of chromosomes.
answer is A.
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Detailed Solution
Bivalent chromosomes which appear as tetrad are more clearly visible at the pachytene.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.