Principles Of Inheritance Mock Tests

16 questions available

Principles Of Inheritance Mock Test 1

Questions: 16

Sample Questions

Class 12 Biology

A man with blood group A marries a woman with blood group B. Their child has blood group O. What are the possible genotypes of the parents:

A Father: I^A i, Mother: I^B i

B Father: I^A I^A, Mother: I^B I^B

C Father: I^A i, Mother: I^B I^B

D Father: I^A I^A, Mother: I^B i

Class 12 Biology

Codominance differs from incomplete dominance in that:

A In codominance, both alleles are fully expressed simultaneously in the heterozygote, while in incomplete dominance, the heterozygote shows an intermediate phenotype

B In codominance, the heterozygote shows an intermediate phenotype, while in incomplete dominance, both alleles are fully expressed

C Codominance occurs only in sex-linked traits, while incomplete dominance occurs in autosomal traits

D Incomplete dominance produces a 1:2:1 genotypic ratio, while codominance produces a 3:1 ratio

Class 12 Biology

Pleiotropy occurs when:

A A single gene influences two or more seemingly unrelated phenotypic traits

B Two or more genes influence a single phenotypic trait

C Two alleles of a gene are both fully expressed in the heterozygote

D The alleles of two different genes assort independently during gamete formation

Class 12 Biology

Mendel's law of independent assortment is based on which type of cross, and what does it state?

A Dihybrid cross — alleles of different genes segregate independently during gamete formation

B Monohybrid cross — dominant alleles always mask recessive alleles

C Dihybrid cross — alleles of the same gene segregate during gamete formation

D Test cross — recessive parent reveals the genotype of the dominant parent

Class 12 Biology

In a cross between two heterozygous pea plants with round yellow seeds (RrYy x RrYy), the proportion of offspring with recombinant phenotypes (round green or wrinkled yellow) is:

A 6/16

B 9/16

C 3/16

D 8/16

Class 12 Biology

Which of the following statements about codominance is correct?

A One allele completely masks the expression of the other in the heterozygote

B Both alleles are fully expressed in the heterozygote, producing a distinct phenotype

C The heterozygote shows a blended intermediate phenotype between the two parents

D The trait is controlled by a single gene on the X chromosome only

Class 12 Biology

Molecular diseases in humans include:

A Sickle cell anaemia and phenylketonuria (PKU)

B Down syndrome and Turner syndrome

C Haemophilia and colour blindness

D Cystic fibrosis and muscular dystrophy only

Class 12 Biology

The phenomenon where one gene affects two or more seemingly unrelated traits is called:

A Pleiotropy

B Polygenic inheritance

C Epistasis

D Linkage

Comments

No comments yet. Be the first to share your thoughts!