Sexual Reproduction and Genetic Variation Lesson 43

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.

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

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

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?

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

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

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)

Brain break https://www.youtube.com/watch?v=fcGDUcGjcyk Sexual vs asexual https://www.youtube.com/watch?v=hfwmlps0Lco How much trash is in the ocean

Classwork https://www.youtube.com/watch?v=tFZeyFbBLXE Sexual Reproduction https://www.youtube.com/watch?v=jk2RJm5RBEk Asexual Reproduction

Jeopardy https://www.playfactile.com/mckinneylifescience