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16 Cards in this Set
- Front
- Back
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Diploid number |
Two sets of chromosomes (2n); the diploid number for a human cell is 46 (2 x 23) |
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Embryo |
The stage of a multicellular organism following fertilization |
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Embryonic development |
Early development of a multicellular organism following fertilization |
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External fertilization |
Fertilization in which a sperm and an egg cell unite outside the bodies of the parents (salmon) |
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Fertilization |
The process during which an egg cell is penetrated by a sperm cell and the haploid genetic information of both male and female gametes combines |
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Gametes |
Specialized cells necessary for reproduction; in animals, male gametes are called sperm cells and female gametes are called eggs cells |
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Genetic diversity |
Inherited genetic differences in a species that give many organisms a survival advantage |
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Haploid number |
Each set of inherited chromosomes, half the diploid number (n): humans inherit one set of 23 chromosomes from their mom and one set of 23 chromosomes from their dad |
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Homologous chromosomes |
A pair of matching chromosomes |
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Internal fertilization |
Fertilization in which sperm cells are deposited inside the females body where they meet egg cells |
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Mating |
The process by which gametes arrive in the same place at the same time |
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Meiosis ( I and II) |
The process that produces gametes with half the number of chromosomes as body cells |
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Sexual reproduction |
Reproduction that requires two parents and produces offspring that are genetically different from each other, from either parent, and from other member of their species |
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Zygote |
The new diploid cell formed by the process of fertilization, which receives half its chromosomes from its female parent and half from its male parent |
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Morula |
A ball of cells of about 0.2 mm in diameter that forms after the first week of embryonic development |
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Blastula |
A hollow ball of cells about 1.5 mm in diameter that forms after the second week of embryonic development |
