I have read this book it contain huge knowledge about chromosome, this book define chromosome number in all species with their characters like human being contain 46 chromosomes, 23 comes from father and 23 comes from mother in result they become 46, they are found in nucleus, generally chromosomes appear like threads having four types like metacentric, telocentric, sub metacentric etc .human have 46 chromosome from which 44 are autosome and 2 sex chromosome in male sex chromosome are xx while female in xy