Choose the best answer

1		Which is the normal sex chromosome combination for a male?
			A)	XX
			B)	XY
			C)	YY
			D)	XXY
2		How many pairs of autosomes are inherited by a normal zygote?
			A)	2
			B)	22
			C)	23
			D)	44
			E)	46
3		A zygote that does not inherit an X chromosome is
			A)	male.
			B)	female.
			C)	non-viable.
4		A zygote that does not inherit a Y chromosome is
			A)	male.
			B)	female.
			C)	non-viable.
5		According to our book, individuals with Down syndrome have 3 copies of chromosome 21.
			A)	True
			B)	False
6		Individuals with two Y chromosomes are more likely to be criminally aggressive.
			A)	True
			B)	False
7		An individual with attached earlobes must have inherited two recessive genes for that trait.
			A)	True
			B)	False
8		Recessive characteristics controlled by X-linked genes are only expressed in females.
			A)	True
			B)	False
9		To be affected by a dominant genetic disorder, a person must inherit two dominant genes for that disorder.
			A)	True
			B)	False
10		Gene therapy often uses viruses to introduce genes into the cells of patients.
			A)	True
			B)	False
11		Males are more likely than females to have X-linked disorders.
			A)	True
			B)	False
12		If a child is born with a genetic disorder that neither parent shows, the disorder is probably dominant.
			A)	True
			B)	False
13		Individuals with a Y chromosome are always male, no matter how many X chromosomes are inherited.
			A)	True
			B)	False
14		Genonomy is the study of genomes at the molecular level.
			A)	True
			B)	False
15		Cystic fibrosis (CF) is an autosomal recessive disorder.
			A)	True
			B)	False
16		Dark or shaded-in circles in a pedigree indicate __________.
			A)	a carrier male
			B)	a carrier female
			C)	female with the trait
			D)	male with the trait
17		The most common lethal genetic disorder among Caucasians in the United States is
			A)	Huntington disease
			B)	Hemophilia
			C)	Cystic fibrosis
			D)	Neurofibromatosis
18		The most common autosomal abnormality is _________ .
			A)	poly-X
			B)	Turner syndrome
			C)	Down syndrome
			D)	cleft lip