LIFE SCIENCE

Detailed explanation-1: -It is well known that meiosis in mammalian spermatogenesis produces  50% Y-and  50% X-chromosome-bearing sperm, a 1:1 ratio.

Detailed explanation-2: -You can’t inherit more than half of an ancestor’s DNA You receive 50% of your genes from each of your parents, but the percentages of DNA you received from ancestors at the grandparent level and further back are not necessarily neatly divided in two with each generation.

Detailed explanation-3: -While we commonly think of chromosomes being primarily DNA, in fact, chromosomes are about 40% DNA and 60% associated packaging proteins like histones.