Learn Before
Fertilization
Fertilization is the fusion of a sperm and an egg, a process that initiates genetic variation. In humans, both the sperm and the egg contribute 23 chromosomes each. Their combination results in the formation of a zygote, a single cell containing a complete set of 46 chromosomes, organized into 23 pairs.
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Learn After
Zygote
Zygote
A new single-celled organism is formed when a sperm and an egg fuse, with each contributing a set of chromosomes. If an error occurs causing one of the contributing cells to have an extra chromosome, what is the most direct consequence for the newly formed organism?
Microscopic View of Fertilization