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Home > All Images > 2004 > February > 9 Feb 2004

Images Dated 9th February 2004

Choose from 26 pictures in our Images Dated 9th February 2004 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Mendels peas Featured 9 Feb 2004 Print

Mendels peas

Mendel's peas. Historical artwork of the peas (Pisum sp.) used by Gregor Mendel (1822-1884) in his experiments into heredity. He cross-bred peas that produced yellow (A) and green (B) peas. This produces a generation in which the peas are yellow (C). This is because the colour of the peas is controlled by an allele in which yellow colour is dominant. An allele is a pair of genes that have different effects on the same characteristic, for instance controlling pea colour. By breeding the C generation peas together, Mendel found that the next generation had a mixture of pea colours (D). The ratio of yellow to green peas was 3:1. His work formed the basis of genetic theory


Hyades open star cluster seen through a prism Featured 9 Feb 2004 Print

Hyades open star cluster seen through a prism

Star spectroscopy, Optical image of thespectra of the stars in the Hyades open cluster.It was obtained by placing a thin prism at the endof a telescope. With this technique, known asobjective prism spectroscopy, the image of everyobject in the field is turned into a smallspectrum. Hundreds of spectra are obtained on asingle photographic plate, although at lowresolution. The thin dark lines in the spectra areabsorption lines which are caused by atoms ofvarious elements present in the outer layers ofthe stars. This technique is mainly used fordetecting different types of objects, notablyquasars, in surveys of large regions of the sky

© Freeman D Miller/Science Photo Library