Unit 4
Tetrad: when a homologous
pair is in synapsis
Homologous pair: one
Chapter 9 maternal and one paternal
Meiosis: the division of a sex chromosome
cell to create 4 new cells Centromere: connecting part
-prophase I: homologous of a chromosome
chromosomes pair, crossing Centrosome: organizes
over microtubules to provide
-metaphase I: pairs line up in structure to the cell
middle (2 rows)
-anaphase I: chromosomes
separate (tetrad and dyad)
-telophase I: cytokinesis- 2
cells
Crossing over: pieces of
chromosomes exchange to
increase genetic diversity
Synapsis: pairing of
-prophase II: spindles attach
homologous chromosomes
-metaphase II: chromosomes
before crossing over
line up (1 row)
-anaphase II: chromatids
split to opposite sides
-telophase II: nuclear
envelope assembles,
chromosomes decondense- 4
cells Independent assortment:
random alignments of
chromosomes to increase
genetic diversity
Nondisjunction: failure of
pairs to separate during
anaphase
Tetrad: when a homologous
pair is in synapsis
Homologous pair: one
Chapter 9 maternal and one paternal
Meiosis: the division of a sex chromosome
cell to create 4 new cells Centromere: connecting part
-prophase I: homologous of a chromosome
chromosomes pair, crossing Centrosome: organizes
over microtubules to provide
-metaphase I: pairs line up in structure to the cell
middle (2 rows)
-anaphase I: chromosomes
separate (tetrad and dyad)
-telophase I: cytokinesis- 2
cells
Crossing over: pieces of
chromosomes exchange to
increase genetic diversity
Synapsis: pairing of
-prophase II: spindles attach
homologous chromosomes
-metaphase II: chromosomes
before crossing over
line up (1 row)
-anaphase II: chromatids
split to opposite sides
-telophase II: nuclear
envelope assembles,
chromosomes decondense- 4
cells Independent assortment:
random alignments of
chromosomes to increase
genetic diversity
Nondisjunction: failure of
pairs to separate during
anaphase
