BIOL 121 Lecture Notes - Lecture 3: Meiosis, Nuclear Dna, Ploidy
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BIOL 121 Full Course Notes
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Unreplicated chromosome: a molecule of dna consists of base pairs. Replicated chromosome: exact replicate (2 copies of the same chromosome (2 dnas) Gene: certain amount of base pairs together that acts as a unit (instructions) to build protein. One chromosome from dad and 1 exact chromosome from mom. Unreplicated chromosome contains gene b1, then the replicated chromosome contains 2 gene b1s and is connected. (results in haploid) Notice the difference between replicated chromosomes and 2 separate chromosome. Haploid: one copy ( unreplicated or replicated) of each chromosome. (n) Diploid: two copies of each chromosome. (2n) Diffrerent sizes of chromodomse is because of the difference in number of base pairs. The number of nuclear dna molecules per cell is halved in meiosis but remains constant in mitosis. Division of the genetic material in the nucleus that produces daughter cells genetically identical to the parent cell. Mitosis is the basis of asexual reproduction and is involved only in the.
