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Multiple Choice
In sexually reproducing eukaryotes, meiosis begins with which type of cell?
A
A haploid gamete (sperm or egg)
B
A diploid germ cell (e.g., a primary spermatocyte or primary oocyte)
C
A somatic diploid cell in G1 that will undergo mitosis
D
A zygote formed after fertilization
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Verified step by step guidance
1
Understand the context: Meiosis is a specialized type of cell division that reduces the chromosome number by half to produce haploid gametes (sperm or egg) from diploid cells.
Identify the starting cell type for meiosis: Meiosis does not begin with haploid gametes or a zygote; instead, it starts with a diploid cell that will undergo two rounds of division.
Recognize that the diploid cell that undergoes meiosis is a germ cell, specifically called a primary spermatocyte in males or a primary oocyte in females.
Differentiate germ cells from somatic cells: Somatic cells undergo mitosis, not meiosis, so a somatic diploid cell in G1 is not the correct starting point for meiosis.
Conclude that meiosis begins with a diploid germ cell, which will then proceed through meiosis I and meiosis II to produce haploid gametes.