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Asexual Reproduction

Growth of new organisms without the fusion of nuclei (sexual reproduction). Usually involves one parent and leads to clones (genetically identical offspring).

Binary fission

Division of a cell into two equally sized cells (a type of asexual reproduction). Most bacteria do this.


Division of a cell where one begins as an outgrowth of the parent cell. A type of asexual reproduction.


Asexual reproduction in which new individuals receive genetic information from a single parent cell (instead of a combination of two parents).


fusion of nuclei from two gametes (sex cells) during sexual reproduction. (Resulting cell is a zygote).


Type of asexual reproduction in which a piece breaks off from a parent.


Reproductive cells (like sperm or eggs). Contains one set of unpaired chromosomes ("normal" cells contain two sets). During sexual reproduction two gametes fuse together.


Special type of cell division resulting in gametes (sex cells with half of the "normal" amount of genetic information).


Cell division. Can be a form of asexual reproduction.

Ova (singular: ovum)

female gametes. Also known as eggs. Much larger than sperm.

Sexual reproduction

fusion of nuclei of two gametes.


male gametes. Usually motile (can move).


Asexual reproductive cells that can develop directly into a complete organism (usually found in fungi).


reproducing asexually using spores.


the first cell resulting from the fusion of two gametes. Contains a full set of genetic information (half from a sperm, half from an egg).

Steps to Cloning

1.Obtain an egg cell and remove its contents. 2.Obtain a somatic (normal) cell of the organism you would like to clone and extract its DNA. 3.Inject the DNA into the empty egg cell. 4.Treat with chemicals until it begins to grow. 5.Implant the egg into a surrogate. 6.Wait until birth.

Artificial Embryo Twinning

Purposely dividing growing ball of cells. When this occurs naturally it forms twins.


place where an ovum matures. On surface of an ovary.


Mature ovum bursts out of follicle (middle of 28 day cycle)



Uterus (what happens during ovulation and beyond?)

Thickens and new blood vessels, preparing to support a growing embryo.

Uterus (why must it thicken?)

For fertilized egg to implant.

Ovum (period of time it can be fertilized?)

10-15 hours after ovulation

Sperm (period of time it can fertilize?)

72 hours (can be deposited three days before ovulation)

Corpus luteum

structure that follicle becomes after ovulation. Begins releasing progesterone, which maintains a thickened uterus.

If no pregnancy

corpus luteum disintegrates after about 12 days, hormones drop


part of thickened uterine lining passes through vagina and out of body.

Reproductive Strategy

Things that make a species successful. Includes items such as number of offspring, length of gestation, age of sexual maturity, development of offspring prior to birth, time spent with offspring, etc.

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