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Apparently the first use of the term "Haldane's dilemma" was by paleontologist Leigh Van Valen in his 1963 paper "Haldane's Dilemma, Evolutionary Rates, and Heterosis". Van Valen writes: [8] Haldane (1957 [= The Cost of Natural Selection]) drew attention to the fact that in the process of the evolutionary substitution of one allele for another ...
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 ...
The study was published in a 101-paged article in The Journal of Hygiene in 1908; where Haldane was described as "Jack Haldane (age 13)" for whom it "was the first time [he] had ever dived in a diving dress". [28]: 436 The research became a foundation for a scientific theory called Haldane's decompression model. [29]
The masking effect of outcrossing is known as genetic complementation, [3] an effect also recognized as hybrid vigor or heterosis. Once outcrossing is established in a lineage of flowering plants due to the benefit of genetic complementation, subsequent switching to inbreeding becomes disadvantageous because it allows expression of the ...
R.A. Fisher in 1930 [17] and J.B.S. Haldane in 1932 [18] set out the mathematics of kin selection, with Haldane famously joking that he would willingly die for two brothers or eight cousins. [19] In this model, genetically related individuals cooperate because survival advantages to one individual also benefit kin who share some fraction of the ...
A flight attendant has reportedly been injured after falling from a plane at an airport in England. On Monday, Dec. 16, at approximately 4:30 p.m. local time, the woman — who works for the ...
The parents of a 10-year-old boy who hanged himself in May after “horrific bullying” are suing their son’s school, claiming staff covered up complaints and punished victims who spoke up ...
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 ...