Facts: previous knowledge 1.Male sex cell is called the __________ 2. Female sex cell is called the __________ 3. All body cells have ________ chromosomes; sex cells have _____ each so when they join together there will be a full set of 46
Animals: Sexual Reproduction Sexual Reproduction in Animals 1. Animals, some plants, fungi, protists 2. 2 parents= male & female 3. Sex cells (Gametes) –Male= sperm –Female= egg
Asexual Reproduction Methods Binary Fission 1. Bacteria 2. Organism divides in half 3. 2 identical daughter cells produced (half the size of their parent) 4. Daughter grows to parental size- then divides
Comparing Asexual & Sexual Reproduction Create a T-chart to compare the following: –How many parents? –Are sex cells needed? –What numbers of chromosomes are involved? (at the beginning and at the end) –Are offspring different from or identical to parents and why? –What types of organisms?
What are the advantages of each: Asexual- Sexual-
ANSWERS: ADV. Sexual- variation in traits evolution asexual- no mate needed DISADV.
Comparing Reproduction Types ASEXUAL –46 --> 46 –One parent –Cells produced are identical to the parent- no gene mixing –No –Some plants, animals, and fungi SEXUAL –23 + 23 --> 46 –Two parents –Cells produced are different from their parents- due to gene mixing –Yes –Bacteria, amoeba, algae, growing plants, animals, and fungi
Websites Animal Reproduction Animations Animal Life Cycles