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 inheri
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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 inheri
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
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 inheri
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