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how is DNA passed down from one generation to the next?

2007-03-18 14:49:57 · 5 answers · asked by Anonymous in Science & Mathematics Biology

5 answers

Depends on the organism and the method of reproduction.

At the cellular level, when cells divide, they replicate their DNA and then give each of the daughter cells a copy of the original DNA. Asexual reproduction is similar; each daughter organism has a copy of the DNA.

Sexual reproduction is more complex. Basically what happens is that two different organisms (or two different parts of the same organism in hermaphrodites) will undergo meiosis, which produces 4 cells with half the original amount of DNA. Then these cells with half the original amount of DNA (called gametes) will combine with other gametes, and they fuse together into one cell who becomes the daughter organism..

2007-03-18 14:56:22 · answer #1 · answered by kz 4 · 1 0

When a mommy and daddy love each other very much they have sexual intercourse which is done by the penis going into the vagina. When the male ejaculates his sperm into the vagina the sperm go for a journey to fertilize the eggs. The sperm carry 23 chromosomes and the egg carries 23 chromosomes. When the sperm and the egg fuse it is call ed a zygote. The DNA fuse to create you through the allele and genes. They make up your eye color, hair color, if you have a wang or doodle, ect. Grade nine science comes in handy eh?

2007-03-18 22:14:51 · answer #2 · answered by Kristopher A 1 · 0 0

You receive one-half of your DNA from your mother and one-half from your father. DNA is what allows for the transmission of genetic material from one generation to the next. When your father’s sperm and your mother’s egg cells combine at fertilization, they create your genetic sequence in 23 pairs of chromosomes (46 total).

2007-03-18 22:25:09 · answer #3 · answered by Question101 2 · 0 0

Half of each parent's chromosomes are included in the egg and sperm. When the egg and sperm join, the resulting offspring will have a complete double set of chromosomes: one set from Mom and one set from Dad. These chromosomes contain the DNA.

2007-03-18 21:54:40 · answer #4 · answered by ecolink 7 · 0 0

through mating

2007-03-18 21:54:16 · answer #5 · answered by dj opelac(shs II dalton) 1 · 0 1

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