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Endocrine, Reproduct
Vocabulary for science test 4/10/2012
| Question | Answer |
|---|---|
| Cell Division | Def. - The process of one cell dividing into two daughter cells. |
| Chromosome | Def. - A structure made of DNA and protein in the nucleus of a eukaryotic cell. |
| Reproduction | Def. - The formation of new organisms of the same species. |
| Asexual Reproduction | Def. - A type of reproduction that requires only one parent. |
| Sexual Reproduction | Def. - A type of reproduction that involves special cells called sex cells. |
| Sex Cells | Def. - Special cells that contain half the number of chromosones as body cells. |
| Meiosis | Def. - Cell division that produces sex cells with half the number of chromosomes. |
| Diploid | Def. - A double/complete set of chromosomes. |
| Haploid | Def. - A half set of chromosomes. |
| Fertilization | Def. - The union of an egg and sperm. |
| Zygote | Def. - A fertilized egg. |
| Embryo | Def. - An organism in its earliest stage of development. |
| Cell Differentiation | Def. - The process of cell specialization. |
| Adaptation | Def. - An inherited trait that helps an organism to survive. |
| Evolution | Def. - The process of how organisms acquire adaptations over time. |
| Ancestor | Def. - An organism from which others have descended. |
| Cladogram | Def. - A tree-like diagram that displays evolutionary relationships among living species and their ancestors. |
| Homologous structures | Def. - Body structures that have a common origin but do no necessarily perform the same function. |
| Vertebrates | Def. - Animals with a backbone. |
| Natural Selection | Def. - The process by which organisms with favorable adaptations survive and reproduce at a higher rate than organisms with less-favorable adaptations. |
| Genetic Variation | Def. - The variety of alleles in a population. |
| Testes | Def. - Produce sprem and testosterone. |
| Hormone | Def. - A chemical that regulates body functions. |
| Semen | Def. - A mixture of sperm and fluid that is ejaculated during sexual intercourse. |
| Ovaries | Def. - Female organs that produce eggs and female hormones. |
| Ovulation | Def. - The release of a mature egg from the ovary. |
| Follicle | Def. - A structure of the ovary where an egg matures. |
| Implantation | Def. - The process in which an embryo becomes embedded in the lining of the uterus |
| Umbilical Cord | Def. - Contains arteries and veins that connect the embryo to the placenta. |
| Fetus | Def. - An embryo that has developed for 8 weeks and has formed the major structures. |
| Process of Natural Selection | 1. Populations over-reproduce. 2. Individuals in a population vary. 3. Favorable adaptations are selected. 4. Favorable adaptations accumulate. |
| Evolution of New Species | 1. Isolation 2. Adaptation 3. Differentiation |
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BubbleKS99
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