Multiple Choice
Which statement best describes a spermatid during the development of animal gametes?
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9. Mitosis and Meiosis
Development of Animal Gametes
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Horse diploid cells contain 64 chromosomes (2n=64). How many chromosomes will be present in primary oocyte cells?
A
32
B
64
C
128
D
40
Verified step by step guidance1
Understand the concept of diploid cells: Diploid cells contain two sets of chromosomes, one from each parent. In horses, the diploid number is 64, meaning there are 64 chromosomes in total.
Recognize the role of primary oocytes: Primary oocytes are cells in the ovary that undergo meiosis to form eggs. They are diploid cells, just like other somatic cells in the organism.
Recall that primary oocytes have not yet undergone meiosis: Before meiosis, primary oocytes maintain the diploid number of chromosomes, as they are still in the initial stage of gamete formation.
Apply the diploid number to primary oocytes: Since primary oocytes are diploid, they will have the same number of chromosomes as other diploid cells in the organism, which is 64 for horses.
Conclude that the number of chromosomes in primary oocyte cells is the same as the diploid number: Therefore, primary oocyte cells in horses contain 64 chromosomes.
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