Reduced hybrid viability affects two species that rarely marry and create zygotes, but whose incompatible genes prevent the resulting embryo from developing.
What are zygotes?
A zygote is a eukaryotic cell created when two gametes fertilize one another. The genome of the zygote, which is made up of the DNA from each gamete, has all of the genetic material for a brand-new unique organism.
The zygote represents the earliest developmental stage of multicellular organisms. A zygote is produced when an egg cell and sperm cell combine to form a new, distinct organism, as is the case in humans and the majority of other anisogamous organisms. The zygote can split asexually through mitosis in single-celled organisms to create identical progeny.
Reduced hybrid viability refers to an organism's lesser chance of surviving if its parents share genetic traits that are incompatible, typically as a result of their mating despite being of different species.
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