help~!~!~
2007-03-21 11:22:29 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Having two chromosomes is very important. One comes from one parent, the other comes from the other parent. This is why we are basically a genetic melding of our two parents. When we produce gametes(sperm, egg), one of those chromosomes is passed on to the next generation. This contributes to a wide differentiation in species, important for survival.
2007-03-21 12:30:18 · answer #1 · answered by redsox579 2 · 1⤊ 0⤋
Because we have two biological parents. One chromosome is from mother and the second chromosome is from the father which forms the pair.
2007-03-21 11:29:35 · answer #2 · answered by D J 2 · 1⤊ 0⤋
They don't. Some plants have chromosomes in groups of three or more:
Triploid (groups of 3) crops: banana, apple, ginger
Tetraploid (groups of 4) crops: durum or macaroni wheat, maize, cotton, potato, cabbage, leek, tobacco, peanut, kinnow, Pelargonium
Hexaploid (groups of 6) crops: chrysanthemum, bread wheat, triticale, oat
Octaploid (groups of 8) crops: strawberry, dahlia, pansies, sugar cane
During Meiosis I, the chromosome pairs are split up to make two haploid cells. During Meiosis II, these two haploid cells split into 4 haploid gametes. This is probably why chromosomes occur in pairs in animals and most plants.
2007-03-21 11:31:56 · answer #3 · answered by Anonymous · 1⤊ 1⤋
because they know not to swim alone.
2007-03-21 11:31:06 · answer #4 · answered by doc 6 · 0⤊ 0⤋