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Sex Cells- Sperm and Eggs
Meiosis is a process that occurs in male and female
reproductive organs. Meiosis forms sex cells—
sperm and eggs. These cells have 23 chromosomes,
half the number of chromosomes as the
parent cell.
Fertilization
During sexual reproduction, a sperm sperm
fertilizes an egg, and the genetic
information from the parents is egg
combined. The fertilized egg is called a
Human Karyotype
zygote, and has 46 chromosomes.
egg
sperm
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18
zygote
(fertilized 19 20 21 22 or
egg) XX (female) XY (male)
Humans have 46 chromosomes that are
The Zygote present in 23 pairs. One chromosome in
The zygote contains all the information needed each pair is inherited from the mother,
to form a new organism. Every cell of the and the other from the father.
organism descends from this original cell.
zygote
blastocyst fetus
embryo
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