1. Aim What are the differences between meiosis and mitosis?

2. Meiosis and Mitosis
What are some similarities ? 1.Replication 2. The DNA only replicates once 3.DNA is passed onto new cells produced

3. First difference 46 46 46 How many times do cell divide in mitosis?
Once
How many times do cell divide in meiosis?
Twice
Explain why these sex cells contain half the amount of chromosome than a normal boby cell? 46 46 46 23 46 23 46 46 23 23

4. How do daughter cells compare in each processes?
Mitosis produces cells which are identical
Meiosis produce gametes which are genetically different
Asexual reproduction or
Tissue repair
Sexual reproduction
(crossover during meiosis)

5. When does each occur? Asexual reproduction Tissue repair Growth
Mitosis
Meiosis
Asexual reproduction
Tissue repair
Growth
Production of sperm cells
Production of egg cells
(Crossover)

6. Why are gametes genetically different?
Crossover or sorting
Process during meiosis where genes on different chromosomes begin to switch causing
recombination of genes and variety
Genes begin to switch from chromosomes

7. Meiosis- Gamete production
What are the steps?
DNA replication occurs once
Cell division occurs twice during meiosis
4 sex cell are produced with half the amount of chromosomes and genetically different

8. 1. In humans, which cell is produced most directly by mitotic cell division?
1.a sperm cell
2.a skin cell
3.an egg cell
4.a zygote

9. 2. Normal mitotic cell division results in each daughter cell having
1.half the number of chromosomes as the parent cell
2.the same number and kinds of chromosomes as the parent cell
3.the same number but different kinds of chromosomes as the parent cell
4.twice the number of chromosomes as the parent cell

10. 3. The process of meiotic cell division in a human male usually forms
1.one diploid cell, only
2.four diploid cells
3.one monoploid cell, only
4.four monoploid cells

11. 4. Which statement is true of both mitosis and meiosis?
1.Both are involved in asexual reproduction.
2.Both occur only in reproductive cells.
3.The number of chromosomes is reduced by half.
4.DNA replication occurs before the division of the nucleus

12. 5. Which cell process occurs only in organisms that reproduce sexually?
1.mutation
2.replication
3.meiosis
4.mitosis

13. 6. The diagram below represents the genetic contents of cells before and after a specific reproductive process.
This process is considered a mechanism of evolution because it
decreases the chance for new combinations of inheritable traits in a species
decreases the probability that genes can be passed on to other body cells
increases the chance for variations in offspring
increases the number of offspring an organism can produce

14. 7. The puppies shown in the photograph below are all from the same litter.
The differences seen within this group of puppies are most likely due to
overproduction and selective breeding
mutations and elimination of genes
evolution and asexual reproduction
sorting and recombination of genes