Answer :
With normal inheritance, 1/2 of the world’s human population receives an "x" chromosome from their mother and all of the world’s human population receives a "y" chromosome from their father.
According to genetics, an inherited characteristic or variation is one that is encoded in DNA and is transmitted from parent to child during reproduction. Mendelian genetic principles control inheritance.
Understanding illness transmission patterns requires knowledge of the fundamental laws of inheritance. The inheritance patterns of single gene diseases are frequently referred to as Mendelian because Gregor Mendel was the first to notice the various patterns of gene segregation for particular traits in garden peas and was able to calculate the likelihood of a trait recurring in subsequent generations. An accurate family history will be crucial to identifying a pattern of transmission if a disease runs in the family. A family history can also help rule out hereditary disorders, especially for common diseases.
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