| NSES Content Standard C
Life Science: Reproduction and heredity Grades 5-8, page 157 In many species, including humans, females produce eggs and males produce
sperm. Plants also reproduce sexually--the egg and sperm are produced in
the flowers of flowering plants. An egg and sperm unite to begin the development
of a new individual. That new individual receives genetic information from
its mother (via the egg) and its father (via the sperm). Sexually produced
offspring never are identical to either of their parents.
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Benchmark 5B The Living Environment:
Heredity
Grades 6-8, page 108
In some kinds of organisms, all the genes come from a single parent,
whereas in organisms that have sexes, typically half of the genes come
from each parent.
Benchmark 5B The Living Environment:
Heredity
Grades 6-8, page 108
In sexual reproduction, a single specialized cell from a female merges
with a specialized cell from a male. As the fertilized egg, carrying genetic
information from each parent, multiplies to form the complete organism
with about a trillion cells, the same genetic information is copied in
each cell.
Benchmark 5B The Living Environment:
Heredity
Grades 9-12, page 108
The sorting and recombination of genes in sexual reproduction results
in a great variety of possible gene combinations from the offspring of
any two parents.
Benchmark 6B The Human Organism: Human
Development
Grades 6-8, page 133
Fertilization occurs when sperm cells from a male's testes are deposited
near an egg cell from the female ovary, and one of the sperm cells enters
the egg cell. Most of the time, by chance or design, a sperm never arrives
or an egg isn't available.