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Biotechnology - 20

1-	The percentage of individual with a given genotype, which exhibits the associated phenotype, is defined as
	A -	penetrance
	B -	expressivity
	C -	inheritance percent
	D -	environmental influence
2-	Diethyl stilbestrol (DES), a synthetic estrogen causes
	A -	chromosome lagging
	B -	disruption of mitotic spindle
	C -	centriole elongation
	D -	All of the above
3-	Bar eye character of Drosophila is due to
	A -	duplication in region of 16A of X chromosome
	B -	deletion in region of 16A of X chromosome
	C -	due to presence of additional X-chromosome
	D -	due to a point mutation in eye-locus
4-	Transmission of a gene from male parent to female child to male grand child is known as
	A -	holandric inheritance
	B -	quantitative inheritance
	C -	criss-cross inheritance
	D -	maternal inheritance
5-	The degree or extent to which a given genotype is expressed phenotypically in a particular individual is defined as
	A -	penetrance
	B -	expressivity
	C -	inheritance strength
	D -	environmental influence
6-	How many chromosomes are there in Caernorhabditis elegans?
	A -	3
	B -	6
	C -	9
	D -	12
7-	If two genes show 50% recombination
	A -	they are on different chromosomes
	B -	they are on same chromosome but far apart
	C -	Both (a) and (b)
	D -	they are closely located on the same chromosome
8-	Which of the following denotes a pair of contrasting characters?
	A -	Alleles
	B -	Phenotype
	C -	Homozygous
	D -	Genotype
9-	A map of chromosomes that utilizes cloned and sequenced DNA fragments rather than genetic markers is known as
	A -	a physical map
	B -	a genetic map
	C -	a cloning map
	D -	None of these
10-	In a dihybrid cross, the progeny of an Fl individual (hetero2ygous for both characters) will show a phenotypic ratio of
	A -	1:1:1:1
	B -	1:2:2:1
	C -	9:3:3:1
	D -	3:1:1:3

[Người đăng: Thành Lãm - ST]

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