Article Abstract:
A professor of ecology and evolutionary biology at Princeton University describes his perspective on the development of plants and animals. He also recounts his experiences during a visit at the University College in London, where he was invited to give three lectures. During his stay in the UK, he met Halden Spurway and his wife Helen. They would often meet to discuss about animal behavior and its evolutionary implications. His meetings with the Spurways led to a sporadic correspondence with the couple.
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Article Abstract:
The duration of egg laying in tits is 20-30 seconds, in Prairie Warblers four minutes, and eight to nine seconds in Goldcrests. The recovery phase which follows egg-laying lasts for 30-90 seconds in tits and 39-53 seconds in Goldcrests. The egg-laying duration is different in case of Great and Willow tits which is due to the difference in size. Egg-laying occurs 42 minutes earlier in the Willow tits as compared to the Great tits.
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Article Abstract:
Genetic analysis can be applied to smaller families through ascertainment corrections. This method incorporates whole pedigrees while examining smaller units such as nuclear families, resulting in a generalization of the ascertainment-correction formula. The appropriate corrections are the reciprocal of the marginal probabilities sums of all individuals relevant to ascertainment, if affected.
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