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
Microscopic View of Fertilization
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?