Half of the ova will carry an extra chromosome (n + 1), which upon fertilization will result in zygotes with a chromosome count of (2n + 1). What is this condition called?

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Aneuploidy. A gamete with n+1 has one extra chromosome, so after fertilization the zygote becomes 2n+1. This is not a change in whole chromosome sets (polyploidy); it is an abnormal number of individual chromosomes, called aneuploidy.

Half of the ova will carry an extra chromosome (n + 1), which upon fertilization will result in zygotes with a chromosome count of (2n + 1). What is this condition called?

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