12. Meiosis
Genetic Variation During Meiosis
19PRACTICE PROBLEM
Humans have 46 chromosomes, 23 of which come from the mother and the other half from the father. In some cases, the number of chromosomes may become different and this can cause chromosome abnormalities. The condition in which there is a presence of three homologous chromosomes in chromosome 21 is called _____, while the condition brought by the presence of three sets of chromosomes is called ______.
Humans have 46 chromosomes, 23 of which come from the mother and the other half from the father. In some cases, the number of chromosomes may become different and this can cause chromosome abnormalities. The condition in which there is a presence of three homologous chromosomes in chromosome 21 is called _____, while the condition brought by the presence of three sets of chromosomes is called ______.