I’m running Schol Bio tuts again this year, & I like to start each session off with a question on some aspect of biology, just to start everyone thinking in that space. In the last session I presented two images (see below) and asked the students: what are possible genetic explanations for what you’re seeing […]
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I’m really enjoying running on-line tuts with Schol Bio students, because the questions & discussions are so interesting. (So, hopefully the students enjoy them too!) Last week we got onto talking about the enzyme lactase and the fact that in some populations many individuals continue to produce it into adulthood (thus making them lactose-tolerant, & […]
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This post is intended for students who are preparing for the 2023 Schol Bio exam, and discusses material covered in a tutorial meeting. One of the obvious questions is, what’s the examiner looking for? Like the NCEA subjects. Scholarship subjects all have assessment specifications. You’ll find the Biology one here. The written exam will comprise […]
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Humans are the only living hominid that can throw objects accurately & at speed – while some of the other great apes can throw objects, their speed & accuracy is not the best. (In his musing on human evolution, Darwin noted that adaptations allowing this would be at a selective advantage as they would increase […]
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This is a post of two parts: the interesting tale of convergence involving crab-like creatures, and the very poor – nay, crappy (because I like the alliteration) – headline on a popular article about it. Part 1: the history of carcinization in crustaceans, described in this 2017 paper in the Biological Journal of the Linnean Society […]
Continue readingThis morning I got up (at the rather early and unaccustomed hour of 3.30am) to listen to a webinar by paleoanthropologist Dr Jeremy DeSilva¹. Titled “First Steps”, his presentation was about the origins of bipedalism in the human lineage. It was a fascinating session & I thought I’d turn my notes into this post, to […]
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n July this year, the Seattle Times ran a story on an orca called Tahlequah – she was pregnant, again. And just yesterday, she gave birth. The story is particularly noteworthy because a couple of years ago, Tahlequah also bore a calf, which died, and she then carried the dead baby on her nose for […]
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Midas cichlids (Amphilophus spp.) are a popular aquarium fish, but in the wild they’re found in South America, ranging from Nicaragua to Costa Rica. The 2018 Schol Bio paper included a really interesting question about a Nicaraguan ‘species complex‘ of these fish, based on a paper in Nature Communications. and a monograph in Cuadernos de […]
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The 2015 Schol Bio paper included a question about a group of birds known as honeycreepers, specifically, the 56 species endemic to the Hawaiian islands. (Or, were endemic: 18, or perhaps 19, are still living; the others are extinct.) Students who’ve already had a look at this paper as part of their preparation for the exam will […]
Continue readingFor the last few years it’s been pretty much received wisdom that African populations shared only a tiny proportion of their genes, if any, with Neanderthals. In contrast, other non-African sapiens populations had a small but significant admixture of Neanderthal genes. The underlying reason for this, it’s been assumed, is that Homo sapiens and neandertalensis only bred with […]
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