Tuesday, January 3rd 2012

After we got back from winter break, we quickly dove into our next topic, THE MIRACLE OF LIFE!

We began the class by observing an immaculate movie on how different animals and species have sex. While we were watching the movie we were told to observe the different types of fertilization and developments that different organisms go through. The sheet that was supposed to be filled out on page 4 of the unit packet, touched on the requirements, advantages, disadvantages, and examples of both fertilization and sex. The chart below shows the answers. The picture above shows that you can not have sex with different species and not reproduce.

Fertilization Requirement Advantages Disadvantages Examples

External

Outside of body WATER No touching Less chance of fertilization FISH

Internal Mating Increased chances

chances of fertilization Touching Birds

NOW FOR THE DEVELOPMENT PART OF LIFE

EXTERNAL Water or shell No parental care Low survival rate FISH

INTERNAL place to hold egg Increased survival rate Increased energy to carry humans

Since we are focusing on reproduction we need to know what reproduction means.

Reproduction: The creation of new individuals from existing ones

Sexual vs Asexual

Sexual is the creation of offspring by the fission of 2 haploid sex cells called gametes to form a diploid zygote.

Male gamete= Sperm

Female gamete= Egg

Advantages

Increases genetic diversity and a better way of survival throug sudden environmental changes

Asexual is the creation of offspring that are genetically identical to the parent

Examples include EXAMPLE OF SEXUAL REPRODUCTION ORGANISM

1. Bianary fission

2. Mitosis

3. Fission

4. Fragmentation

5. Regeneration

A Sexual reproduction Example would include your Mom and Dad because they ad to had sex to reproduce what is you today. By doing this your parents have increased the genetic diversity of the environment around you.

An asexual reproduction example would include Bianary fission between bacteria.

Some organisms can reproduce both sexually and asexually depending on environmental conditions.

Hermaphrodite: Equipped with both male and female reproductive systems. This would include a tapeworm because they can reproduce by themselves without any help.

Internal fertilization occurs when sperm are deposited in or near the female reproductive tract. This requires sexual intercourse.

External fertilization occurs when parents discharges gametes into water where the fertilization occurs.

HOMEWORK: Fill out unit packet page 4

Read chapter 26 in textbook