Why are intergeneric crosses almost unknown and interspecific crosses rare in nature?
Answers
Answer:
Male and female animals of two varied related species are mated in interspecific crosses and their fertility varies. In a certain case, the progeny may display desirable features of both the parents and may be of economic value. Example – A mule, whereas the female counterparts can breed with the species which is rare in nature. Intergeneric hybridization, on the other hand, is the cross of two different genera which is almost unknown in nature. They never form the complete zygote and are infertile.
》》Answer《《
Hybrid viability depends upon chromosomes derived from 2 parents to form homologus pairs during gametogenesis. However, unrelated chromosomes seldom resemble in number and sequence of alleles. Therefore inter generic hybrids do not occur. Inter specific hybrids develop only between closely related species. But they are mostly sterile.