| A | B |
|---|
| Meiosis results in the production | of special cells called game |
| Gametes have half the number | of choromosomes as body cells do.\ |
| Diploid means the body cell | has two sets of chromosomes |
| Haploid chromosomes are carried | in gametes |
| Fertilization produces a diploid cell | called a zygote |
| The zygote develops into an | embryo |
| Meiosis is the process that produces | gamete with half the number of chromosomes |
| Crossing over creates an | infinite number of genetic possibilities |
| There are 8 million combinations | possible for each of the 23 pairs of human chromosomes |
| Prophase | crossing over occurs |
| Metaphase | homologous chromosomes pair up at the equator |
| Anaphase | Homoloous chromosomes separate |
| Telophase | One chromosome from each pair is at the pole |
| Genetic diversity is necessary for the | survival of the species |
| Identical twins result when | one embryo splits in two |
| Identical twins have different | fingerprints |
| Anther is where pollen is | produced and stored |
| Filament is a stack that | supports the anther |
| Stigma is the stick lip of the | pistil that captures pollen grains |
| Style - stalk that supports the | stigma in which the pollen tube forms |
| Ovary: swollen base of | pistil containing ovules |
| Ovules are sacs containing | female gametes |
| The early development of an organism | is called embryonic development |
| Ectoderm | outer skin layer |
| Mesoderm | middle skin layer |
| Endoderm | inner skin layer |
| In vitro | means in glass |
| Embryo screening identifies | genetic conditions |
