Meiosis Flashcards
Having three homologous chromosomes
Trisomy
Sister chromatids are pulled to opposite poles
Anaphase II
Male sex chromosomes
XY
Crossing over occurs
Prophase I
Failure of chromosomal separation in anaphase I or II of meiosis
Non disjunction mutation
Unique cells are created
Telophase II
A removal of a whole set of genes
Deletion mutation
Homologous pairs separate to opposite sides of the cell
Anaphase I
The copying of a whole set of genes
Duplication mutation
Homologous pairs line up
Metaphase I
The reversal of gene order on a chromosome
Inversion mutation
Genes from one chromosome are moved to another chromosome
Translocation mutation
Homologous chromosomes pair up
Prophase I
Having one 23rd chromosome (X)
Turner’s syndrome
Cytoplasm splits in two
Telophase I
Spindle fibers form
Prophase II
4 haploid cells are created
Telophase II
Having a third 21st chromosome
Down syndrome
Female sex chromosomes
XX
Having only one chromosome instead of a homologous pair
Monosomy
A greater or lesser number of chromosomes in offspring
Aneuploidy
Chromosomes condense
Prophase II
Having a third 18th chromosome
Edward’s syndrome
Chromosomes line up single file
Metaphase II
2 haploid cells are formed
Telophase I
Having a third 13th chromosome
Patau syndrome
XXY or XYY in males
Klinefelter’s syndrome
