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10.2 Meiosis and Sexual Reproduction

How many cells are made during meiosis? four cells
How many divisions are there in meiosis? two divisions
What types of cells are made in meiosis? gametes (cells used in sexual reproduction) = sperm and egg cells
What happens in meiosis I (the first division)? the (homologous) pairs of chromosomes separate
What happens in meiosis II ( the second division)? the centromeres split and the duplicated chromosomes separate
Do cells go through interphase before meiosis? Yes, the chromosomes still double.
How does the chromosome number change in meiosis? The number of chromosomes are half of what they started at before the chromosomes duplicated in the parent cell. It starts diploid, and ends up haploid.
What does diploid mean? "double" chromosome number - the chromosomes are in pairs.
What does haploid mean? "single" chromosome number - the chromosomes are single
What is the human diploid number of chromosomes? 46. We have 23 pairs of chromosomes in our regular body cells.
What is the human haploid number of chromosomes? 23. We have 23 chromosomes in our egg/sperm cells.
What happens in fertilization? egg and sperm combine
What is the cell formed in fertilization called? a zygote
How do identical twins form? one egg and one sperm form one zygote, which splits in its early stages of cell divisions and devleops into two genetically identical embryos
How do fraternal twins form? two separate sperm fertilize two separate eggs, which develop together in the womb
Created by: jenhaugen01