Occasional

... the things their fathers and mothers are doing in an imperfect way, in the homes, in the shops and on the farm." - General Education Board, Occasional Papers, No. 1 (General Education Board, New York, 1913) p. 6. 'Evolution' is the tool.

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... in their native Asian environments. These little wasps would be heartily welcomed by those of us with a BMSB problem, and we also enjoy seeing the occasional pheasant. So, what do you folks think about the issue?

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... the genetic information carried in that cell. However, it does not introduce any variation, because the DNA is copied exactly (barring the occasional mutation). Meiosis is another matter. :) 2) Sounds about right. A mutation is a copying error that occurs during DNA replication. Most of ...

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... making a physical measurement of particle sizes. Minor chemical contamination is unlikely to perturb the measurement (but see below). For an occasional thorough cleaning, I'd guess a wash in dilute sulfuric acid (remember to add the acid to the dilution water, not the other way around) followed ...

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... ants are the result of alternating generations. Haploid males mate with the diploid female queens, which then birth many sterile females and the occasional diploid female capable of parthenogenesis. Only unmated parthenogenetic females are capable of birthing males. Please elaborate on "polar ...

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