Monday 19 March 2012

Is Dominace Always Dominant?

Dominace is not always dominant. It depends on what your testing. Certain plants always display dominace while others do not. We did an online lad to prove this. With Pea plants which mendel tested dominace was always expressed and that's how he came to that conclusion. The Pink flowers were dominant because when it was crossed with the white only pink flowers came out. Pea plants which we experimented with first show dominace and the color is dominated by the dominant allele when it was expressed. In the snapdragons example that came next, incomplete dominace was shown most of the colors randomly appeared. Incomplete dominace is a form of inheritance were the alle is not always dominant always the other one. I came up with this conclusion since when I crossed certain colors such as Red1 and White1 8 pinks came out which ment they both of them were reccesive and none of them were heterozygus The third example we tested were lentils, which were co-dominant. This means that both alelles in the gene pair are expressed equally, they are fighting for dominace. I concluded that because when the spots and dots were both dominant when they were crossed with each other, while with the spots and dots were not dominant.

In conclusion dominace is not always dominant, dominace is only dominant it depends on what you are testing. Pea plants are always dominant, while snapdragons show incomplete dominace and Lentils show co-dominace.


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