BIOL 121 Lecture Notes - Sister Chromatids, Homologous Chromosome, Allosome
terubarenuka and 39551 others unlocked
44
BIOL 121 Full Course Notes
Verified Note
44 documents
Document Summary
Process of uniting sperm and egg (in sexual reproduction [sr]) All the cells are products of mitotic divisions from the first nucleus that formed at fertilization. Nuclear division that leads to a halving of chromosome number. Precedes formation of eggs and sperm in animals. Sex chromosome is the chromosome associated w/ sex of the individual. Homologous chromosomes carry the same genes (but may have diff. alleles) Section of dna that influences one or more hereditary traits in an individual. Have two versions of each type of chromosome. Diploid organisms have two alleles of each gene one on each of the homologous pairs of chromosomes. Chromosome number in each cell is reduced during meiosis. The homologs in each chromosome pair separate from each other. One homolog goes to one daughter cell; the other homolog goes to the other daughter cell. Therefore, diploid (2n) becomes (n) in daughter cells of m1.