Why do the chromosomes in a body cell occur in matching pairs?
Because both members of each pair come from the mother
Because the cell copies each chromosome to keep a spare
Because chromosomes pair up at random when the cell forms
Because each parent supplies one chromosome of the pair✓Правильный ответ
Объяснение
Fertilisation brings one set of chromosomes from the egg together with one set from the sperm, so every pair holds one member from each side of the family. If both members came from the mother the offspring would carry nothing from the father, and the pairs would not link the two parents at all.