Download Chapter 7 directed reading

LHWHS Biology
NAME____________________
Directed Reading
Chapter 7 - Meiosis and Sexual Reproduction
---Meiosis--1. What is meiosis ?
a form of cell division that halves the number of chromosomes when
forming reproductive cells (gametes in animals, spores in plants)
IN TOTAL, HOW MANY TIMES DOES A CELL DIVIDE DURING MEIOSIS I AND
MEIOSIS II ?
Twice
2. What is the result of meiosis ?
4 haploid cells
---Tetrads and Crossing Over of Genetic Material---3. How many chromatids form a tetrad ?
4
4. What crosses over during "crossing-over" ?
portions of the chromatids
----Independent Assortment---5. When does independent assortment occur ?
Metaphase of Meiosis II
6. What is another word for "allele" ?
gene
7. Are genes (or alleles) on different chromosomes linked together
?______
no
------Formation of a Sperm
8. What is spermatogenesis ?
The process by which sperm is produced in male animals
9. How many sperm are made during spermatogenesis ?
4 from 1 haploid
----Formation of the Egg Cell---10. What is oogenesis ?
The process by which eggs are made in female amimals
11. How many egg cells are made during oogenesis ?_______
1
Provide a hypothesis (guess) explaining why three of the haploid cells die
during oogenesis ?
They don’t have enough cytoplasm – they may be missing important
organelles
----Comparing the Results of Meiosis and Mitosis---12. Describe the primary difference between meiosis and mitosis.
Meiosis produces 4 haploid cells. The cells produced have half as many
chromosomes as their parent cell
----Comparing Haploid and Diploid Cells---13. Once again, describe the difference between haploid and diploid
cells.
Haploid cells have half as many chromosomes as diploid cells
In your body, most cells are haploid
or
(circle one)
diploid
???
----Fertilization---14. What is the name of the cell that results from fertilization ?
Zygote