7.Dominant alleles that cause disease are especially dangero

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7.Dominant alleles that cause disease are especially dangerous because __________.
A heterozygous individuals will develop the disease
B the severity of the disease is greater than that of diseases caused by recessive alleles
C individuals must inherit two dominant alleles to show the disease
D dominant alleles are inherited more frequently than recessive alleles
8.Alterations in chromosomal structure or number that occur during mitosis or meiosis are seldom seen because __________.
A they do not affect the organism
B the altered genes are crucial to development and the organism does not survive to birth
C the effects are so mild that they often go unrecognized
D the effects are usually masked by more serious conditions
9.A man carries a Y-linked trait.He will pass this trait on to __________.
A all of his daughters
B 50% of his sons and none of his daughters
C 50% of his daughters and 100% of his sons
D all of his sons

B 显性基因遗传疾病特征比隐形基因遗传更危险
B
D 男性构成是XY,女性是XX,所以只能遗传到儿子身上
再问：第一题选A好像
再答：若双亲都是患者，其子女有3/4的可能发病（双亲均为杂合体，子代中纯合体患病占1/4，杂合体患病占1/2，纯合体正常占1/4，设致病基因为A，则Aa*Aa=1/4AA（纯合患病）+2/4Aa（杂合患病）+1/4aa（正常）），若患者为致病基因的纯合体，子女全部发病。所以选A是正确的 B是错的，该疾病的严重程度大于所引起的隐性等位基因的疾病是不对的，显性基因比起隐性基因患病概率更加高一些。

why do people commit crimes?what cause are especially import 英语翻译Many of us think that all wild (野生的) animals are dangero 2.The leading cause of his disease is that he smokes __ more There are always causes that cause causes to cause causes. 英语翻译peroxisomes are especially prevalent in cells that are s there are dozens of risk factors that result heart disease.3 the scientists researched the cause of the disease是什么意思 multiple alleles是什么意思 Cause clouds Are everything, You are mine cause 英语翻译The acceleration effect assumes that dominant plants can that they talk too much about certain problems and dominant