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Home > All Images > 2003 > October > 23 Oct 2003

Images Dated 23rd October 2003

Choose from 34 pictures in our Images Dated 23rd October 2003 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Mendelian inheritance Featured 23 Oct 2003 Print

Mendelian inheritance

Mendelian inheritance in fowls, as a result of parental genes. P = parents, F & F2 = 1st and 2nd generation, D = dominant, R = recessive. Most inherited characteristics or traits are determined by multiple genes (sections of DNA), but some, such as colour in Analusian fowls, are governed by a single gene. These are known as Mendelian, named after Gregor Mendel the founder of genetics. The offspring of most plants and animals contain a mixture of genes from their parents. Certain genes are dominant over others, but if incomplete dominance (or blending) occurs then a new trait will result, in this case a grey colour. Mendelian traits occur in strict mathematical ratios


Artwork of drug transmission to brain nerve cell Featured 23 Oct 2003 Print

Artwork of drug transmission to brain nerve cell

Drug action on nerve cell. Illustration of thetransmission of a drug from a capillary into anerve cell of the brain. The walls of a braincapillary (red, at bottom) are much less permeableto molecules than those elsewhere in the body.However small molecules (blue spheres) can leavethe capillary and travel up to the astrocyte (orange), which supports and selectively screensmolecules from the nerve cell (green). This blood-brain barrier stops harmful molecules fromreaching the brain. Drugs treating Parkinson's disease, Alzheimer's disease and schizophrenia reach the brain in this way. Dendrites (pink) carry nerve signals fromother nerve cells

© John Bavosi/Science Photo Library