Do Now1. 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?

ReproductionThe 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 ReproductionThe 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

ReviewAsexual 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

ReviewIf 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

ReviewThe 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

ReivewThe 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

ReviewA 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

ReviewWhich two organisms in the diagram typically reproduce asexually?

A and H

C and F

E and G

F and I