Pattern Baldness , moustache and beard in humans is example of :A. Sex linked trait B. Sex limited trait C. Sex influenced traitD. Sex determined trait

It is considered miniatures form of human as per Preformation theory of A.V Leeuwenhoek(1632-1723).

Pangenes are considered invisible , identical copies of organs which are transported from all parts to reproductive part through blood . This theory was given by Darwin. This theory is obsolete and has no any scientific basis. Thus, in today's date it is totally disregarded.

Sources of genetic variations are as follows:

1. Crossing over in sexually reproducing organisms. Here , exchange and recombination of genes occur between homologus non-sister chromatids.

2. Mutation due to any physical , chemical or biological agents.