Trisomy
Trisomy 21, Down's syndrome, is viable.
The minimum viable population of domestic cats in the hundreds. There will likely never be an extinction of cats though.
Genetic anomalies where the normal compliment of chromosomes is either more or less than the expected value. In humans the most common trisomy occurs with chromosome 21 and results in Down Syndrome. Very few instances of fewer than a 2N chromosome count result in viable offspring although a child with a single X (sex chromosome) can reach term.
they are lethal and cause spontaneous abortion of the embryo early in development.
Neanderthals and humans were genetically similar enough to be able to produce viable offspring when interbreeding occurred. The hybrid offspring likely benefited from gene flow between the two populations, leading to increased genetic diversity. Additionally, the ability to interbreed indicates that Neanderthals and humans were closely related species.
Neanderthals and humans are genetically similar. Less than one percent difference in their DNA.
Yes. Abnormal sperm are less likely to fertilize an egg and more likely to create a non-viable embryo which can lead to miscarriage.
It is possible to graft an apple to fig tree. However, the hybrid will likely not be viable or fruit-producing.
Yes
viable entity
After about 10 days if she has not returned they will most likely not be viable. This depends on temperatures and weather.
Human activities can directly lead to the spread of desertification. This is because humans can use up all of the viable resources in a location.