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“儿子象妈妈,女儿象爸爸”,这是人们对相貌遗传的一种认识,这话是有一定的道理,但不完全正确。遗传学告诉我们,有些基因位于性染色体上。X染色体比较大,它上面可以载有百余个基因,Y染色体很小,含有的基因就很少。既然基因是遗传物质或遗传信息,那么,伴随性染色体的某些遗传性状和特征,就和性别有关,这就是伴性遗传。有些是由母亲传给儿子,但不传给女儿;有些是由父亲传给女儿,而不传给儿子;也有和上述
“Son like a mother, daughter like a father,” This is a people on the appearance of a genetic understanding of the word is a certain truth, but not entirely correct. Genetics tells us that some genes are located on sex chromosomes. X chromosome is relatively large, it can carry more than a hundred genes, Y chromosome is very small, contains very few genes. Since the gene is a genetic material or genetic information, then some of the genetic traits associated with sex chromosomes and characteristics, and sex, which is the genetic inheritance. Some are passed from mother to son, but not to daughter; some are passed from father to daughter, not to son;