Most human parents-to-be assume that the sex of their child comes down to a flip of the chromosomal coin, with an equal chance of having a boy or girl. But in reality, the odds aren’t even -for every 100 girls born, the world gains about 106 baby boys.
CREDITS
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Created by Henry Reich
Narrated by: Emily Elert
Production and Writing Team: Alex Reich, Peter Reich, Emily Elert, Ever Salazar, Kate Yoshida, and Henry Reich
Music by Nathaniel Schroeder
OTHER CREDITS
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Elephant Seal 1
Photo by: Roy Mangersnes
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Elephant Seal 2
Photo by: Mike Baird
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White tailed deer
Photo by: Public Domain
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Key Deer
Photo by: IanarÈ SÈvi
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Male Lion
Photo by: Wikimedia user Robek
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Baby Lion
Photo by: Flickr user fortherock
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Brad Pitt
Photo by: Foreign and Commonwealth Office
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Kids
Photo by: Barbara Hobbs
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REFERENCES
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Coale, A.J. (1991). Excess female mortality and the balance of the sexes in the population: An estimate of the number of "missing females." Population and Development Review 17(3): 517-523.www.jstor.org/d...
Clutton-Brock, T. H., Albon, S. D., and Guinness, F. E. (1986). Great expectations: dominance, breeding success and offspring sex ratios in red deer. Animal Behavior 34: 460-471. www.kora.ch/mal...
Kalben B. (2000). Why men die younger: causes of mortality differences by sex. North American Actuarial Journal 4(4): 83-111. www.soa.org/ne...
Schnettler, S. (2013). Revisiting a Sample of U.S. Billionaires: How Sample Selection and Timing of Maternal Condition Influence Findings on the Trivers-Willard Effect. PLoS ONE 8(2): e57446. www.plosone.org...
Song, S. (2012). Does famine influence sex ratio at birth? Evidence from the 1959-1961 Great Leap Forward Famine in China. Proceedings of the Royal Society B 279(1739):2883-2890. rspb.royalsocie...
Thogerson C.M., Brady, C.M., Howard, R.D., Mason, G.J., Pajor, E.A., Vicino, G.A., and Garner, J.P. (2013) Winning the genetic lottery: biasing birth sex ratio results in more grandchildren. PLoS One 8(7):e67867. www.plosone.org...
Trivers, R.L., and Willard, D.E. (1973). Natural selection of parental ability to vary the sex ratio of offspring. Science 179: 90-92. www.sciencemag....
26 сен 2024