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We began our experiment exposing the chick embryos to 50ug and 100ug of lead acetate. However, this experimental attempt was not successful because all but one of the embryos died. Due to the previous results, we adjusted our next experiment using lower concentrations of lead acetate such as 12.5ug and 25ug (
Table 1).
Our control embryos were all H & H stage 24. Eleven out of twelve chick embryos were normal, and one died. In the normal chick embryos there are 3 distinct visible parts of the brain, hind-, mid-, and fore-brain. Blood is dispersed throughout the embryo from the fore-brain to the tail with a noticeable concentration in the mid back (
Figure 1, 2).
Three out of the eleven chick embryos that were exposed to 12.5ug of lead acetate died (
Graph 1). There was normal development of seven and one was underdeveloped (Graph 2). The underdeveloped embryo had blood heavily concentrated in areas that differed from the control, such as the three brain regions and the upper back (Figure 3).

© Cebra-Thomas, 2001

Last Modified: 31 May 2001

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