Download Aim What are the similarities and differences between mitosis and

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
• How many times do cell
divide in mitosis?
Once
46
46
46
23
46
46
46
23
23
23
• 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?
How do daughter cells compare in each
processes?
Asexual reproduction or
Tissue repair
Sexual reproduction
(crossover during meiosis)
• Mitosis produces
cells which are
identical
• Meiosis produce
gametes which
are genetically
different
When does each occur?
Mitosis
• Asexual
reproduction
• Tissue repair
• Growth
Meiosis
• 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
1.decreases the chance for new combinations of
inheritable traits in a species
2.decreases the probability that genes can be passed on
to other body cells
3.increases the chance for variations in offspring
4.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
1.overproduction and selective breeding
2.mutations and elimination of genes
3.evolution and asexual reproduction
4.sorting and recombination of genes