When does crossing over usually occur, and what is the endresult?a. It occurs during prophase of meiosis I, and the end result isthe exchange of pieces between homologouschromosomes.b. It occurs during prometaphase of meiosis I, and the endresult is the exchange of pieces between homologouschromosomes.c. It occurs during prophase of meiosis I, and the end result isthe separation of sister chromatids.d. It occurs during prometaphase of meiosis I, and the endresult is the separation of sister chromatids.
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
When does crossing over usually occur, and what is the end
result?
a. It occurs during prophase of meiosis I, and the end result is
the exchange of pieces between homologous
chromosomes.
b. It occurs during prometaphase of meiosis I, and the end
result is the exchange of pieces between homologous
chromosomes.
c. It occurs during prophase of meiosis I, and the end result is
the separation of sister chromatids.
d. It occurs during prometaphase of meiosis I, and the end
result is the separation of sister chromatids.
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