12th class (Fsc) Biology unit 8 MCQs
chapter 8 MCQs 12th Class Biology
Variation and Genetics:
1. The position of gene one chromosome is called its:
a. Locus
b. Allele
c. Genotype
d. Phenotype
2. The genes found in a breeding population constitute:
a. Gene frequency
b. Genotype
c. Gene pool
d. Genome
3. The form of appearance of the trait is called:
a. Karyotype
b. Genotype
c. Heterozygous genotype
d. Phenotype
4. Locus is:
a. Partner of gene
b. Part of DNA
c. Complement of gene
d. Position of gene
5. The gene pool consists of all alleles at all gene loci in all individual of:
a. Population
b. Individual
c. Community
d. Species
6. A full set of genes of an individual is called:
a. Karyotype
b. Genome
c. Dominance
d. Genotype
7. Expression of a trait is termed as:
a. Wild type
b. Genotype
c. Dominance
d. Phenotype
8. Mendelian factors were renamed as “ genes” by:
a. Johannsen
b. Mendel
c. Morgan
d. Correns
9. The cross which is used to find out the homozygous or heterozygous nature of the genotype is called:
a. Monohybrid cross
b. Test cross
c. Dihybrid cross
d. Reciprocal cross
10. In test cross, heterozygous produces:
a. 50:50
b. All round
c. All wrinkle
d. None of these
11. What happens when both alleles of a gene pair independently express in a heterozygote?
a. Over dominance
b. Dominance
c. Codominance
d. Incomplete dominance
12. A heterozygote offspring quantitatively exceeds the phenotypic expression of both the homozygote parents due to:
a. Over dominance
b. Dominance
c. Codominance
d. Incomplete dominance
13. Different alleles of a gene that are both expressed in a heterozygous condition are called:
a. Complete dominant
b. Co dominant
c. Incomplete dominant
d. Over dominant
14. MN blood group is example of:
a. Incomplete dominance
b. Complete dominance
c. Over dominance
d. Co dominance
15. Incomplete dominance was discovered by 4’o clock plant in 1899 by:
a. Carl Correns
b. Devries
c. Tscharmach
d. Jhannsen
16. Rh blood group system is named after its:
a. A patient
b. Discover
c. Rhinoceros
d. Rhesus monkey
17. The individuals called universal recipient have ………:
a. O blood group
b. A blood group
c. AB blood group
d. B blood group
18. In 1901, ABO group system was discovered by:
a. Bern Stein
b. Punnet
c. Wiener
d. Karl Landsteiner
19. Secretors have dominant secretor gene “ Se” o chromosome:
a. 21
b. 09
c. 24
d. 19
20. ABO blood group system in man is encoded by a polymorphic gene I on chromosome:
a. 21
b. 07
c. 10
d. 09
21. ABO Blood group system was discovered by:
a. Bernstein
b. Landsteiner
c. Waldayer
d. Levine
22. When a single gene has multiple phenotypic effects, the phenomenon is called:
a. Pleiotropy
b. Codominance
c. Sex-linkage
d. Epistasis
23. A gene with multiple phenotypic effect is called:
a. Epistatic
b. Polygenic
c. Pleiotropic
d. Multiple allele
24. Bombay phenotype is an example of:
a. Probability
b. Pleiotropy
c. Epistasis
d. Dominance
25. When a gene or gene pair at one locus, interferes with or hides the effect caused by another gene or pair at another locus, the phenomenon is:
a. Co-dominance
b. Pleiotropy
c. Dominance
d. Epistasis