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BIO318Y5 (33)

2nd half Lecture 5

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Darryl Gwynne

Lecture 5 Sexual selection: What is it? Why are Males Masculine, Females Feminine and Occasionally Vice-Versa? Operational Sex Ratio Relative Parental Investment In sea horses, females provide the eggs and the males care + protect the eggs. Sexual selection on female katydids Body size: Heavyweights preferred by males Sexual selection for large males The most prolific father of all time is believed to be the last Sharifian Emperor of Morocco, Mulai Ismail (1646-1727). In 1703 he had at least 342 daughters and 525 sons and by 1721 he was reputed to have 700 male descendents. said to be the father of 888 children through a harem of 500 women. The greatest number of children produced by a mother in an independently attested case is 69 by the first wife of Fyodor Vassilet (1816-72) a peasant of the Moscow Jurisdiction, Russia, who in 27 confinements, gave birth to 16 pairs of twins, 7 sets of triplets and 4 sets of quadruplets. Most of the children attained their majority. Mme. Vassilet became
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