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(1) These two types of dog can interbreed/be interbred .

(2) Some of the wolves had interbred with domestic dogs.

(3) Since the birds interbreed they cannot be classed as different species.

(4) Did they trade, make war, interbreed?

(5) Their energy and physique had been sapped by interbreeding.

(6) Fish of different shape are already reluctant to interbreed.

(7) There, he said,(sentencedict.com) many animals interbred and created monsters.

(8) Of the few species that do have the opportunity to interbreed, none do so frequently.

(9) Theoretically, as we have seen, a species is a form which can not interbreed successfully with any other.

(10) Their ruthless pursuit of Navajos in the 1860s led to isolation of a small band, which interbred, risking genetic disorders.

(11) Although they can be prevailed upon to interbreed in captivity, they never do so in the wild.

(12) Interbreeding with feral cats is probably the biggest threat to the wildcat.

(13) The number of interbreeding populations is unknown, as are chances for long-term survival.

(14) Gray moths still could interbreed with black moths, proving that they belonged to the same species.

(15) Gloucestershire cattleman Guy Wooding will judge the inter-breed championship on the afternoon before the sale.

(16) Interbreeding Common Among Various Types of Humans?

(17) Prolonged interbreeding in any species can eventually lead to serious birth defects.

(18) Because as soon as you have interbreeding, all those barriers [between those groups of animals] break down. Sentencedict.com

(19) Varieties and eventually species would be formed despite any tendency for interbreeding with the main body of the population in the centre.

(20) While Europe and Asia might now be viewed as a hotbed of interbreeding, modern humans who stayed in Africa appear to have been active interbreeders as well.

(21) A previously unknown kind of human—the Denisovans—likely roamed Asia for thousands of years, probably interbreeding occasionally with humans like you and me, according to a new genetic study.

(22) However, harmful effects are more common in groups with a history of interbreeding over several generations.

(23) A fundamental category of taxonomic classification, ranking below a genus or subgenus and consisting of related organisms capable of interbreeding.

(24) Some genes stay around in a population, or mix themselves into surrounding populations via interbreeding.

(25) In fact, recent evidence from the sequencing of the Neanderthal genome suggests interbreeding, meaning we are part caveman.

(26) P??bo acknowledges the complexity of finding new hominids in mitochondrial DNA, which in animals such as mice can pass from one species to another via interbreeding.

(27) Gene flow The movement of alleles within and between populations of the same species through interbreeding.

(28) But O'Brien argued that Eastern and Western pumas had been interbreeding for millennia before highways and housing developments intervened: This would not be a "man-made" creature.

(29) Darwins and Wedgwoods mated for several generations, like an experiment in interbreeding, and the "sacred cause" was an inherited characteristic.

(30) So really the nuclear DNA does not help us decide if Denisovans are a new species, though the evidence for interbreeding with modern humans suggests they are not.