In the case of the Bombina frogs, the evidence that hybrid zone
stability is occurring was the consistent pattern from annual to annual of declining
frequency of yellow-bellied toad alleles with distance from the edge of their
range. This is a clear evidence that hybridization is taking place yearly in
the Bombina frogs.
It would be Family Kingdom.
Image shows answer, obtained from google.
Bb × bb = 2 Bb : 2 bb = 1 Bb : 1 bb
Thus, the phenotypic ratio would be 1 Dominant Phenotype : 1 Recessive Phenotype.
In my opinion
Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. One famous mass extinction event is the one that lead to the extinction of dinosaurs, 65 million years ago.
I hope it’s help
