Select 5 correct answer(s) Question 5 options: A) In fruit flies, sex is determined by the ratio of the number of X chromosomes to sets of autosomes.. B) In mammals, sex is determined by a single gene on the X chromosome. C) Sister chromatids are held together by unreplicated centromeres. D) Crossovers, in combination with sister chromatid cohesion, physically connect homologs at metaphase of meiosis I. E) Homologous chromosomes have identical DNA sequences. F) In mammals, sex is determined by a single gene on the Y chromosome. G) At mitosis, microtubules attach to kinetochores located at telomeres to segregate sister chromatids to opposite poles. H) Chromosomes that fail to have at least one crossover have an increased risk of meiosis I nondisjunction. I) Sex-influenced traits are due to genes located on the X chromosome. J) Meiosis divides the chromosome number of a cell in half to make gametes used for sexual reproduction.
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:
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