Aim What are the differences between meiosis and mitosis?

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

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

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)

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)

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

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

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

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

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

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

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

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

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