Download Reading Question Meiosis

Ch.11 Meiosis Reading Questions
Name_______________________________, Period_____, Score_______
Pages 244 – 245
1. In sexual reproduction, an _________________ and a _______________ combine to
form a new organism.
2. Daddy Long Legs spiders reproduce sexually. __________________________ is the
process that forms ______________________ and sperm that makes sexual reproduction
possible.
Page 250 - 251
3. ________________________ is a form of cell division that produces daughter cells with
half the number of chromosomes that are in the parent cell.
4. What must happen before meiosis can begin?
5. In meiosis how many times does the nucleus divide?
6. During meiosis, a ____________________ cell goes through two divisions to form
___________________ haploid cells.
7. In meiosis I, homologous chromosomes are ______________________. In meiosis II, the
sister ______________________ of each homologue are separated.
8. What is crossing-over in meiosis? (also see page 253)
9. In what phase of meiosis does crossing over happen?
10. In the meiosis diagram, there are ____________ chromosomes in the cell at the start and
__________ at chromosomes in each cell at the end.
Page 252 – 253
11. Mitosis makes new cells that are used for what?
12. Meiosis makes new cells that are used for what?
13. Which cell division process produces identical cells and which process produces
genetically different cells?
14. Explain how it is possible When two cells, often an egg cell and a sperm cell, combine, the
resulting zygote has the same number of chromosomes as each of the parents’ cells.
15. In prophase I of meiosis, every chromosome pairs with its homologue. A pair of
homologous chromosomes is called a tetrad. As the tetrads form, different homologues
exchange parts of their chromatids in the process of crossing-over. The pairing of
homologous chromosomes and the crossing-over does not happen in mitosis. Therefore,
a main difference between meiosis and mitosis is what?
16. Why is genetic variation an advantage?
17. Name three key contributions to genetic variation.
1.
2.
3.
18. Due to random fertilization, with just one set of parents, how many genetic combinations
can be made in human beings? (In other words how many genetically different kids could
they have?)