Sexual vs. Asexual Reproduction Ms. Porter 7th Grade Science 2013-2014

GOAL To compare forms of sexual and asexual reproduction To understand the process of mitosis

Why do living things reproduce? Your thoughts??

Do all living things reproduce in the same way? Your thoughts??

Purpose of Reproduction To make sure a species can continue. Definition: Reproduction is the process by which an organism produces others of its same kind.

Sexual Reproduction Sexual Reproduction 1. ALWAYS TWO sex cells: sperm and egg 2. Sperm and egg join= fertilization 3. Offspring look different from parent (mixed DNA)

Sexual Reproduction Sexual Reproduction 5. Examples Humans, some flowering plants, mammals, fish, reptiles, etc.

Sexual Reproduction

Asexual Reproduction A new organism (sometimes more than one) is produced from one organism. The offspring will have hereditary material uniform with the hereditary material of the parent organism. This means they will be genetically alike.

Asexual Reproduction Asexual Reproduction 1. One parent 2. No sex cells 3. Offspring produced by cell division (MITOSIS) 4. Offspring identical to parent (exact same DNA) 5. Several types in plants and animals

Types of Asexual Reproduction Fission (Binary fission) Budding Regeneration

Fission Also called binary fission. Becoming two by division of the complete organism. A type of cell division.

Types of Asexual Reproduction 1. Organism divides in half 2. 2 identical daughter cells produced 3. Daughter cells are half the parent’s size 4. Daughter cells grow, then divide too 5. In bacteria Binary Fission

http://wappingersschools.org/RCK/staff/teacherhp/johnson/visualvocab/BinaryFissionParamecium.jpg

http://coris.noaa.gov/glossary/binary_fission_186.jpg

Budding Process by which a new, duplicate plant or animal begins to form at the side of the parent and enlarges until an individual is created. Very common in plants;

Types of Asexual Reproduction Budding 1. Small bud grows out of parent cell 2. Two different sized cells made (with identical DNA) 3. Bud breaks off and grows 4. In yeast and hydra

Regeneration The ability to restore lost or damaged tissues, organs or limbs. It is a common feature in invertebrates, like worms and starfish.

Types of Asexual Reproduction Regeneration 1. Repair/ grow lost body parts 2. Left over cells divide to make more cells 3. Lobsters, starfish, lizards

IMPORTANT! Asexual reproduction results in offspring that are genetically identical to the parent organism Sexual reproduction results in offspring that are genetically different from the parent organisms

I. Asexual Reproduction Advantages Disadvantages Requires only one parent All offspring genetically identical Can populate an area efficiently If the environment becomes hostile all are at risk

II. Sexual Reproduction Advantages Disadvantages Genetic information is shared in sexual reproduction = variety is produced in the species A species with a lot of variation is much less susceptible to any one kind of attack (i.e.… disease, parasites etc…) Organisms have to expend energy in the synthesis of sex organs, finding a mate, courtship, and mating. Much slower Less efficient

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…

What type of reproduction is this??? Explain…