1) What is Mendelian genetics? Answer must include dominance and recessiveness
Mendel's First Law
"The alleles of a gene exist in pairs but when gametes are formed, the members of each pair pass into different gametes. [ Thus each gamete contains only one allele of each gene."
When a particular gene possesses both dominant and recessive alleles, it is possible for incomplete dominance to occur, where the organism at hand expresses a phenotype
morphed by the expression of both the dominant and recessive alleles.
In essence, heterozygous (possessing opposing alleles Rr) organisms derived from homozygous (possessing the same alleles RR or rr) are created, they possess a phenotype different to that of both their parents.
Some of the following examples of monohybrid and dihybrid crossing illustrate this incomplete dominance.
Diploid organisms naturally have a maximum of 2 alleles for each gene expressing a particular characteristic, one deriving from each parent. In some cases, however, more than two types of allele can code for a particular characteristic, as is the case of genetic coding for blood type in humans. Their are up to 6 possible genotypes that code for the four blood groups, A, B, AB and O.
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