Answer:
A. The number of genes on its chromosomes
Explanation:
The reason why genes are so important is because genes can be transcribed to make mRNAs, and mRNAs can then be translated to make proteins. Proteins are an integral part of life, since they regulate so many processes and functions. Therefore, the number of genes (or lack thereof) in an organism defines how the organism is going to function.
Mouth, throat, small and large intestine
Answer: For decreased chances of rejection
Explanation:
The three higly polymorphic MHC 1 genes in human beings are HLA-A, HLA-B and HLA-C.
These determine the compatibility of the organ or tissue in the recipient's body each by the help of many alleles that segregates in a population.
There are very less chances that a random chosen donor will match the a recipient six allele genotype.
This is the reason parent may be the best donor for organ transplantation or tissue transplantation.
