1.酗酒。酒鬼的孩子可能天生就喜欢酒精。最近的研究显示，嗜酒有大约50%的原因都和遗传基因有关，而环境因素只对酒鬼施加一半的影响。
2.乳腺癌。大部分乳腺癌的发病原因至今仍是个谜，然而研究人员却已发现一些特定基因的变异，可导致癌症。有些妇女可能在生命早期染上乳腺癌，而且是两只乳房均会出现癌变。
3.色盲。美国有1000万人辨别不清红色和绿色，但却只有60万妇女出现类似症状。这是因为男人只能继承母亲身上一个X染色体的基因。而女人有2个X染色体，即使一个辨色基因出现缺陷，还有另一个基因可以顶替它的位置。
4.侍强凌弱。当孩子在操场上打架而被“请进”校长办公室时，千万别忘了向父母抱怨一番。这是因为，科学家在人体内发现了一种可以增进好斗性的基因。其中，男孩子的攻击性行为更有可能是从家庭中遗传而来的。
5.肥胖。炸薯条和肥胖基因是支持肥胖的双重“后台”。科学理论揭示，肥胖基因可帮助我们的祖先熬过饥荒，然而在现在这个食物充裕的时代，却正在给我们的生活带来很多麻烦。
6.心脏病。出生于有心脏病、糖尿病、中风或高血压家族史的孩子很可能会沿袭其“传统”。除此之外，如果某人患有先天性心脏缺陷疾病，他的后代心脏出现先天性缺陷的可能性也会稍微偏高。
7.生育双胞胎。虽然双胞胎的出生完全是偶然的事情，但是同一家族中往往会一次又一次地出现双胞胎。这种女人体内会携带一种基因，使她在排卵期产生的卵细胞加倍。虽然男人携带这种基因可能不会让他生出双胞胎，但他却可以把它遗传给女儿，因此未来当上双胞胎的外公还是有可能的。
8.青春痘。研究显示，很多男孩长青春痘，他们的家庭往往也有青春痘“生长史”。同样，父母年轻时如果长出过严重的青春痘，那么他们的孩子很可能也逃不过严重痤疮的困扰。
9.乳糖不耐受。在过去的1万年中，基因变异导致人体对牛奶的消化能力不断改进，但是这种能力却只在那些对喝奶已经习以为常的人群中得到了提高。如果你不能忍受牛奶的话，那么你的亲戚很可能也无法消受这种东西。
10.秃顶。秃顶在男人身上很普遍，它可能跟来自父母一方或双方的几种基因变异有关。而永久性的全秃是一种很罕见的情况，患有此病的人全身毛发都会脱落，他们体内会携带“脱毛”基因。
Baldness
Although baldness is common in men, scientists don't understand much about why so little is going on up there. Genes do play a role, but your mom is not the only one at fault. Baldness is likely due to abnormalities in several genes from one or both parents. People with a rare type of permanent baldness called alopecia universalis, lose hair all over their bodies and carry defective 'hairless' genes.
Lactose Intolerance
The Chinese distaste for milk was thought to be a cultural one, until scientists in the 1960s discovered lactose intolerance in Asians, Africans, and southern Europeans. Within the past 10,000 years, a genetic change allowed the ability to digest milk to evolve, but only where dairy farming was the norm. If you can't tolerate milk, your relatives probably left cow udders alone.
Acne
Go ahead and fault your parents for your pimples. Studies have shown that many school-age boys with acne have a family history of the skin condition. As well, having parents who endured a bad case of zits makes one more likely to suffer from severe acne too.
Having Twins
Although identical twins are random events, fraternal twins pop up in families again and again. A mother doing double diaper duty carries a gene that makes her release multiple eggs during ovulation, called hyperovulation. Although a man who carries the gene will probably not father twins, passing the family trait to his daughter could make him a grandfather of twins. This is why twins sometimes appear to skip generations, even though there's no evidence that twins are more likely to occur every other generation.
Heart Disease
A family history of heart disease, diabetes, stroke or high blood pressure isn't good for your heart. Children of parents with heart and blood vessel diseases are more likely to develop them too. Plus, a person with a congenital heart defect is slightly more likely to have a baby with a heart defect.
Obesity
Super size fries and a heavy set of genes is a recipe for obesity. One scientific theory suggests the same genes that helped our ancestors survive famines are now working against people living in places where food is plentiful. Genes have been shown to be the cause of obesity disorders such as Bardet-Biedl syndrome and Prader-Willi syndrome. Many of today's bulging waistlines have only to do with eating too much of the wrong foods, however.
Bullying
Next time you're in the principal's office with a pink slip for roughhousing on the playground, point the finger at your family. A gene that increases an individual's risk for violence has been discovered. Researchers have also found aggressive behaviors in boys are more likely to be inherited than non-aggressive antisocial behaviors like stealing someone's lunchbox. But genes play a bigger role in female thieves.
Color Blindness
Ten million men in the U.S. cannot distinguish red from green. Yet the disorder only affects less than 600,000 American women. Why? The genes for red and green receptors sit near each other on the X-chromosome. Men only have one X-chromosome, which they inherit from their mother. Meanwhile, women have two, and a normal gene can often balance out a defective one.
Breast Cancer
The cause of most breast cancers is still a mystery, however researches have discovered that mutations in particular genes, such as BRCA1 and BRCA2, cause some cancers. Women who inherit the mutation tend to get cancer early in life and in both breasts. Men with BRCA1 have an increased risk of prostate cancer, while BRCA2 increases the likelihood of cancers in the male breast, prostate, pancreas, and elsewhere.
Alcoholism
Children of alcoholics are not destined to be alcoholics too. But recent research reports about 50 percent of the risk for alcoholism is genetically determined. The environment accounts for the other risky half. The disease is considered genetically complex, meaning that several genes come into play and they can affect individuals differently.
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