Crossover usually occurs when matching regions on matching chromosomes break and then reconnect to the other chromosome. Crossing over is described, in theory, by Thomas Hunt Morgan. He relied on the ...

Every person, male or female, has 22 matching pairs of chromosome—one inherited from each parent—but the 23rd pair is different. This unmatched pair, known as the X and Y sex chromosomes ...

Same as in mitosis, except that the spindle fibers from each centriole attach to one chromosome of a matching chromosome pair. In other words, the fibers from one centriole attach to 23 ...

One copy is carried on a chromosome passed on by the male gamete and one on the matching chromosome passed on by the female gamete. 1 Homozygous for allele r rr Wrinkled 2 Homozygous for allele R ...