meiosis Flashcards
involves combining the genetic information of one parent with that of the the other parent to produce a genetically distinct individual
meiosis
- produces half the chromosomes of the parent cell
- occurs only in sex cells
- gametes fused to form diploid offspring during fertilization
meiosis
two sets of chromosomes (2n), in humans 23 pairs or 46 total
diploid
one set of chromosomes (n) - gametes or sex cells, in humans 23 chromosomes
haploid
Chromosome Pairing
- each chromosome in pair are identical to the other (carry genes for same trait)
- only one pair differs - sex chromosomes X or Y
Homologous pair
Homologous Pair
is the pairing of homologous chromosomes forming a tetrad
synapsis
Homologous Pair
two pairs of chromosomes temporarily joined to each other
tetrad
Chromosome Pairing
chromosomes that contain different genes and do not pair during meiosis
non-homologous chromosomes
Chromatids
duplicated chromosome itself, they contain the exact same alleles and have the same genes
sister chromatids
Chromatids
chromosome couples having the same length, patterns and position of the centromere
non-sister chromatids
Homologous Pair
chromatids of tetrad exchange parts
crossing over
2 main phases of meiosis
Meiosis I & Meiosis II
is also called reduction division because this is where the number of chromosomes of the daughter cells are half of the parents’ chromosomes (haploid)
Meiosis I
division results in reducing the number of chromosomes
Meiosis I
5 subparts of Meiosis I
Prophase I
Prometaphase
Metaphase I
Anaphase I
Telophase I & Cytokinesis I
