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Although neutral evolution remains the consensus theory among modern biologists, [3] and thus Kimura's resolution of Haldane's dilemma is widely regarded as correct, some biologists argue that adaptive evolution explains a large fraction of substitutions in protein coding sequence, [4] and they propose alternative solutions to Haldane's dilemma.
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 ...
In 1957, Haldane articulated Haldane's dilemma, a limit on the speed of beneficial evolution, an idea that is still debated today. [8] He is also remembered for his work in human biology , having coined " clone ", " cloning ", and " ectogenesis ".
Objections to evolution have been raised since evolutionary ideas came to prominence in the 19th century. When Charles Darwin published his 1859 book On the Origin of Species, his theory of evolution (the idea that species arose through descent with modification from a single common ancestor in a process driven by natural selection) initially met opposition from scientists with different ...
1 Haldane's dilemma. 2 Background. Toggle Background subsection. 2.1 the dillema. 2.2 criticisms. 2.3 recent developments. 3 Suggestions for article improvement. 2 ...
Thus one may refer to "three cattle" or "some cattle", but not "one cattle". "One head of cattle" is a valid though periphrastic way to refer to one animal of indeterminate or unknown age and sex; otherwise no universally used single-word singular form of cattle exists in modern English, other than the sex- and age-specific terms such as cow ...
The word dzo technically refers to a male hybrid, while a female is known as a dzomo or zhom. In Mongolian , it is called a khainag (хайнаг). There is also the English portmanteau term of yattle —a combination of the words yak and cattle , [ 1 ] as well as yakow [ 2 ] [ 3 ] —a combination of the words yak and cow .
Pages in category "Works by J. B. S. Haldane" The following 6 pages are in this category, out of 6 total. ... Haldane's dilemma; Haldane's rule; O. On Being the Right ...