2 Key Point #1Sexual reproduction is the process in which organisms produce gametes that combine during fertilization to create a new organism.This process is important so that organisms can make more of their own kind. (ROGER!)
3 Meiosis is the 1st step of sexual reproduction. Key Point #2Meiosis is the 1st step of sexual reproduction.Meiosis is a special form of cell division that occurs in the sex organs of organisms – testes (male) and ovaries (female).Meiosis produces sperm and egg cells
4 This diagram represents sexual reproduction in rabbits “A” represents meiosis (step 1)“B” represents fertilization (step 2)
5 Key Point #3During meiosis, one cell divides into 4 gametes, or egg and sperm cells.
6 Draw this in your notes This is meiosis One cell divides into ____. What is being formed here?What percent of the chromosomes does it have in relation to the parent?
7 Draw this in your notes: This is meiosis One cell divides into 4 gametes.How many chromosomes are found in the parent cell?How many chromosomes are found in the gametes?What fraction or percent is this?
8 Key Point #4Egg and sperm cells contain half of the DNA (chromosomes) as the parent’s normal body cells.
9 How is this different from MITOSIS? CharacteristicMitosisMeiosisNumber of parent cellsProducesAmount of DNA in daughter cellsOccurs inWhat occurs after the process?
10 Let’s Practice: Copy this in your notes OrganismChromosomes in normal body cellsChromosomes in egg cellChromosomes in sperm cellHuman23Fruit fly4Corn plant10Cow60Dog39Elephant56Potato24
11 Key Point #5Step 2 of sexual reproduction is when egg and sperm cells meet. This is called fertilization.
12 Which method shows fertilization? A/B shows asexual reproduction.A/B shows sexual reproduction.
13 Key Point #6Fertilization creates a new organism that has the same number of chromosomes as the parent:half came from mom … half came from dad.