Do Now
1. What are the preexisting cells called before they divide?
Parent Cells
2. What are two new cells called after cell division?
Daughter Cells
3. What does reproduction mean?
Formation of new individuals
AIM: What is the difference
between asexual and sexual
reproduction?
Reproduction
The formation of new individuals
One of most important traits of living things
For a small organism with one cell, they can just
carryout cell division – no dating, no breakups!
Let’s remember…
What classification do organisms have to be to be
able to mate with each other?
Species – organisms must have the same species
classification to mate
Ex: Giraffe cannot mate with a horse because they
are not the same species
Two types of
reproduction
1.Asexual Reproduction
2.Sexual Reproduction
Asexual Reproduction
The production of genetically identical offspring from a single
parent
The daughter cells have the SAME DNA
“a-” prefix means “without” – so reproduction without fusing
reproductive cells
Just like regular cell division!
Asexual Reproduction
Relatively simple, efficient, and effective
Enables populations to increase in numbers quickly
Can occur in single-cellular or multicellular organisms
Ex: Bacteria, Hydra
Review
Asexual reproduction of organisms normally results
in new organisms that contain cells with
1. more chromosomes than are found in the cells of the
parent
2. half the number of chromosomes
3. the same number of chromosomes
4. fewer chromosomes that are found in the cells of
the parent
Review
If an organism reproduces asexually, its offspring will
most likely be
1. genetically different from each other
2. produced from specialized cells known as gametes
3. genetically identical to the parent
4. produced as a result of fertilization
Sexual Reproduction
The fusion of two separate parent cells
Offspring produced by sexual reproduction inherit
some of their genetic information from each parent
Sexual Reproduction
Most plants and animals reproduce sexually
Some single-celled organisms do, too
Ex: Humans, flowers, dogs, cats
Review
The members of a certain species of grass in a lawn
are genetically identical. The best explanation for
this observation is that the species most probably
reproduces
1. by an asexual method
2. after pollination by the wind
3. after pollination by a particular species of bee
4. by identical sperm fertilizing the eggs
Reivew
The diagram shows a sequence of events. The
sequence of events from rabbits to zygote is known
as
1. sexual reproduction
2. fission
3. sporulation
4. vegetative propagation
Review
A colony of red bacteria is allowed to reproduce for 16
generations. A scientist examines the colony at the end of
this time and notes that all the individuals are almost
identical in all characteristics. This evidence suggests that
the bacteria
1.
did not receive the proper nutrients
2. reproduced sexually
3. exchanged genetic material
4. reproduced asexually
Review
Which two organisms in the diagram typically
reproduce asexually?
A and H
C and F
E and G
F and I