Human Ear Lobes
No human looks exactly like any other human, not even identical twins. The basis for the similarity and the reasons for the diversity that is in all species have puzzled people for thousands of years. Several human traits may be used to demonstrate the individuality in humans. Ear lobes are controlled by a single gene with two alleles; each allele producing a distinct phenotype. Alleles are variants of the same gene. All can be used to demonstrate Mendel's Law of Segregation.
Hypothesis
Human Height
If polygenic traits provide a phenotypic variance and phenotypic variation is the sum of genetic variation plus the different environment, then polygenic traits are made by genetic variance and environmental variance.
So…
If human height is a polygenic trait and polygenic traits have phenotypic variation, then human height should have a phenotypic variation.
Human Ear Lobes
If ear lobes are determined by a one gene trait and one gene traits have two alleles, then ear lobes are decided by two alleles making it have two genotypes.
Data (Human Height)
Biology class (period 3)
Biology class (period 1-3)
10 people
Data (Human Ear Lobes)
Biology class (period 3)
Biology class (period 1-3)
10 people
Conclusion
Human Height
My hypothesis that stated, if human height is a polygenic trait and polygenic traits have phenotypic variation, then human height should have a phenotypic variation, was true. According to the data and my chart the phenotypes of human height vary tremendously. I think this has occurred over a long period of time (millions of years of evolution) where a simple height gene has mutated and is present in many copies (alleles) and all alleles contributing to the height. There are so many alleles controlling this one trait that when they all get mixed up lots of outcomes are available.
Human Ear Lobes
My hypothesis that stated, if ear lobes are determined by a one gene trait and one gene traits have two alleles, then ear lobes are decided by two alleles making it have two genotypes, was true. If ear lobes are only determined by one gene then there are going to be two alleles. There is not a very big variation in the ear lobes because it is one gene trait, so no matter how you arrange the two alleles one is going to be dominant and one is going to be recessive, making only two outcomes.
