principles of inheritance & variation- Quiz 4

An allele is dominant, if it is expressed in –

• second generation

• homozygous combination

• heterozygous combination

• both homozygous and heterozygous conditions

In Mendel’s experiments the alleles were

• codominant

• corecessive

• dominant-recessive

• incompletely dominant

In a dihybrid cross between two heterozygotes AaBb x AaBb, if we get 3 : 1 ratio among the offsprings, the reason for this may be

• polygenes

• linked genes

• pleiotropic genes

• hypostatic genes.

Trisomy has a chromosome complement of –

• 2n – 1

• 2n + 2

• 2n + 3

• 2n + 1

Which of the following genes have similar genotypic effect when present separately but produce different trait after interacting together and give a ratio of 9 : 7 in F2 generation?

• Complementary genes

• Jumping genes

• Duplicate genes

• House-keeping genes

Which one of the following is the genotypic ratio in monohybrid cross?

• 9 : 3 : 3 : 1

• 1 : 2 : 1

• 9 : 7

• 3 : 1

The combined form of coupling and repulsion is –

• crossing over

• mutation

• linkage

• disjunction

The phenotypic and genotypic ratios remain same in F2 generation in case of

• dihybrid cross

• supplementary genes

• incomplete dominance

• inhibitory genes

Column A --------------------------Column B

I. Test cross -------------------------A. 9 : 3 : 3 : 1

II. Monohybrid ratio -------B. Tt x tt

III.Back cross ------------------C. Tt x TT

IV. Dihybrid ratio -----------D. 3 : 1

The correct match is –

• I - B, II - C, III - A, IV - D

• I - C, II - D, III - A, IV - B

• I - B, II - D, III - C, IV - A

• I - B, II - D, III - A, IV - C

Column A ------------------- Column B

I. Removal of anther ------------------A. Human blood group

II. Laws of inheritance --------------------B. Emasculation

III.Multiple allelism -----------------------C. Blood group O

IV. Universal donor -------------------D. Mendel

The correct match is –

• I - B, II - D, III - A, IV - C

• I - C, II - D, III - A, IV - B

• I - B, II - D, III - C, IV - A

• I - B, II - A, III - D, IV - C