INTRODUCTION
An allele is a variant form of a gene. Some genes have a variety
of different forms, which are located at the same position, or
genetic locus, on a chromosome. Humans are called diploid organisms
because they have two alleles at each genetic locus, with one
allele inherited from each parent. Mendel developed four
hypotheses. These hypotheses are known as Mendel’s theory of
heredity. The hypotheses explain a simple form of inheritance in
which two alleles of a gene are inherited to result in one of
several traits in offspring.
DISCUSSION AND HYPOTHESIS
- There are different versions of genes.These different versions
account for variations in characteristics. For example, there is a
“yellow-pod” allele and a “green pod” allele of the gene for pod
color.
- When two different alleles (heritable factors) are inherited
together, one may be expressed, while the effect of the other may
be “silenced.” In the case of pod color, the allele for green pods
is always expressed and is dominant. The allele for yellow pods,
which is not expressed, is recessive.
- For each characteristic, an organism inherits two alleles
(heritable factors), one from each parent.
- When gametes are formed, the two alleles (heritable factors) of
each gene are separated
CONCLUSION
- Mendel developed a theory that explained simple patterns of
inheritance in which two alleles are inherited to result in one of
several traits in offspring.
- The law of segregation states that a pair of alleles is
segregated during the formation of gametes and that each gamete has
an equal chance of getting either one of the allele.