1. Sexual Reproduction and Genetic Variation
Lesson 43

2. Activator Answer the following questions in your Science Notebook
Why do we look different from our parents?
Are there clones of the same organisms? Can you name any?
Do clones have the same DNA or different DNA? Explain.

3. Sexual Reproduction
Definition: Production of new living organisms by combining genetic information from two individuals of different sexes.

4. Sexual Reproduction and Genetic Variation
Sexual reproduction increases genetic variation in offspring
Increases the genetic variability in species
Ex. Families  Unique

5. Sexual Reproduction and Genetic Variation
Requires two parents
Two parents’ gametes come together  form a full set of chromosomes.
Create different genetic combinations for that trait.
What are some different alleles we have discussed in class?

6. Asexual
Type of reproduction by which offspring arise from a single organism
It does not involve the fusion of gametes
Clone of parent: Identical DNA

7. Asexual Reproduction and Genetic Variation
There is usually no variation from generation to generation in a species population
Some diversity occurs through mutations

8. Which one is better?
Generally, sexual reproduction is more conducive to driving evolution.
More genetic diversity available for natural selection to work on  evolution over time
Evolution in asexuals typically happens very quickly after a sudden mutation.
Ex. drug resistance in bacteria (MRSA)

9. Brain break https://www.youtube.com/watch?v=fcGDUcGjcyk
Sexual vs asexual
How much trash is in the ocean

10. Classwork https://www.youtube.com/watch?v=tFZeyFbBLXE
Sexual Reproduction
Asexual Reproduction

11. Jeopardy