Asexual vs. Sexual Reproduction

What’s the difference in how

organisms reproduce?

Reproduction of living organisms

takes place in one of two ways

Asexual Sexual

In asexual reproduction, one individual produces offspring that are genetically identical to itself. Budding is a one method of this reproduction. In this method, the offspring grows out of the body of the parent. The Hydra is an example of this.

Mitosis is how the cells divide.

http://www.youtube.com/watch?v=Q6ucKWIIFmg&feature=channel&list=UL&safe=active

MITOSISNucleus

DNA

SameDNA

Same DNA

The original cell’s nucleus splits into 2 parts and the DNA is copied into both parts

What is the process of Mitosis?

Some Organisms That Reproduce By Mitosis

Amoeba Green Algae Ferns

Sea Star

YeastHydra

Sea Anemone

Mitosis is used in Asexual reproduction

As a result, all organisms that are reproduced this way look alike!!!!!

How many times does the cell split in Mitosis???

In sexual reproduction, two individuals produce offspring that have genetic characteristics from both parents.

Sexual reproduction introduces new gene combinations in a population.

http://www.youtube.com/watch?v=mKWxeMMFTEU&safe=active

MEIOSIS (this represents either the egg or sperm cell)

Nucleus Chromosomes

46

New cell New cell

Same 46 chromosomes

Same 46 chromosomes

½ chromosomes

23

½ chromosomes 23 ½ chromosomes

23½

chromosomes 23

Every human organism is formed sexually and has 46 chromosomes. When a sperm cell and egg cell join together, they bring 23 chromosomes each and that gives the final cell (baby) the 46 chromosomes it needs.

The sperm and egg carry the genetic information of each parent and that is why babies can look different. There might be 4 different combinations for each cell.

What is the process of Meiosis?

Some Organisms That Reproduce By Meiosis

Meiosis is used in Sexual reproduction

As a result, almost all organisms that are reproduced this way look different in some ways from other organisms of the same kind.

Why is there more variation in offspring that result from sexual reproduction than asexual reproduction?