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However, when hybrids are produced between both species, the gene flow between the two will continue to be impeded as the hybrid males are sterile. Also, and in contrast with the great vigor shown by the sterile males, the descendants of the backcrosses of the hybrid females with the parent species are weak and notoriously non-viable.
Hybrid sterility can be caused by different closely related species breeding and producing offspring. These animals are usually sterile due to the different numbers of chromosomes between the two parents. The imbalance results in offspring that is viable but not fertile, as is the case with the mule.
The induction of polyploidy is a common technique to overcome the sterility of a hybrid species during plant breeding. For example, triticale is the hybrid of wheat (Triticum turgidum) and rye (Secale cereale). It combines sought-after characteristics of the parents, but the initial hybrids are sterile.
In humans, barring intersex conditions causing aneuploidy and other unusual states, it is the male that is heterogametic, with XY sex chromosomes.. Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if — in a species hybrid — only one sex is inviable or sterile, that sex is more ...
Around 2018, 13 hybrids of Burmese pythons (Python bivittatus) and Indian pythons (Python molurus) among 400 invasive Burmese pythons studied in South Florida were found by the United States Geological Survey. [5] Family Boidae. Hybrids between Columbian boa and yellow anaconda. Genus Corallus. Hybrid between emerald tree boa and Amazon tree boa.
While many automakers predicted a looming all-EV future, Toyota made gains by emphasizing hybrids over fully electric vehicles—a move that earned it derision before being vindicated over the ...
This is a list of hybrid vehicles. A hybrid could theoretically have any two power sources, but hybrid vehicles have typically combined an internal combustion engine with a battery and electric motor(s). This list includes both regular hybrid electric vehicles and plug-in hybrids, in chronological order of first production. Since Porsche made ...
The 2024 Free Press Car, Truck and Utility vehicles of the year demonstrate that despite the auto industry’s inevitable and accelerating shift to electric power, there’s still plenty to ...