Demonstrating Genetic Principles Using Garden Pea Plants

1051 words, 5 pages

Intro Sample...

This lab is based on the experiment that Mendel did with the common garden pea plant, which is when he cross-bred them in order to see how genetics worked. His experiments had many unambiguous genetic markers, perfect to show in the classroom; thus in this experiment. In this experiment, the focus is on encoding six morphological traits: I-i locus which determines a yellow (I) versus a green (i) color, R-r which determines whether it is a smooth (R) or wrinkled (r) seed, Tl-tl for if it produces tendrils (Tl) or terminal leaflets (tl), Td-td for the presence (Td) or absence (td) of foliar dentation, St-st if it has normal (St) or reduced (st) stipules, and le-le to determine if it has a normal height (Le) or a dwarfed height (le).
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Body Sample...

Scores for pea characters

Monohybrid (3:1)

Dihybrid (9:3:3:1)

Beginning with the monohybrid cross, it is expected that out of the 60 samples, 45 should be dominant and 15 should be recessive. What actually happened was that, usually, there were more dominant species than expected, therefore less recessive species than expected. When using the chi-squared test to figure out the probability, all of the variables ended up within the acceptable range of differences between the expected and observed outcomes.
With the dihybrid crosses, on the other hand, there is a total of four possible outcomes in the F2 generation. The homozygous dominant traits, again, tend to have more than what is expected, but the rest of the information varies. When looking at the chi-squared test results, two out of the three crosses are likely to happen 5% or less of the time; these two are the crosses between stipules and tendrils, and stipules and seed texture. One out of the three results show a peculiar result, having a probability of greater than the 5% in occurrence. This is seen in the cross between tendrils and seed texture.
For the monohybrid cross, it makes sense that there were more normal stipules, tendrils, and normal height pea plants in comparison to their counterparts because normal height pea plants were dominant over those dwarfed in stature; yellow was dominant to green; and smooth was dominant to wrinkled. Whichever trait is dominant will tend to appear more often that its recessive counterpart. This, overall, seems to be normal because in ...

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