21. there were only parental combinations in F2 of a dihybrid cross then Mendel might have discovered ?
22. Medelian dihybrid and dihybrid with linkage are respectively related with how many chromosomes?
A. 1 pair & 2 pair
B. 2 pair & 1 pair
C. 2 pair & 2 pair
D. 1 pair & 1 pair
Answer : Option B
23. If distance between gene on chromosome in more , then gene shows :-
A. Less Linkage
B. strong linkage
C. weak linkage
D. incomplete linkage
Answer : Option B
24. Which of the following conditions represent a case of co- dominant genes ?
A. A gene expresses itself , suppressing the phenotypic effect of its alleles.
B. genes that are similar in phenotypic effect when present separately, but when together interact to produce a different trait.
C. Alleles, both of which interact to produce effect in homozygous condition
D. Alleles, both of which interact to produce an independent effect in heterozygous condition.
Answer : Option D
25. A gene located an y - chromosome and therefore, transmitted from father to son is known as
A. Supplementary gene
B. Complementary gene
C. Duplicate gene
D. Holandric gene
Answer : Option D
26. In multiple allele system a gamete possesses
27. Blood grouping in humans is controlled by
A. 4 alleles in which IA is dominant
B. 3 alleles in which IA and IB are dominant
C. 2 alleles in which none is dominant
D. 3 alleles in which IA is recessive
Answer : Option B
28. Muliple alleles are present
A. in different chromosomes
B. at different loci on chromosomes
C. at the same locus on homologous chromosome
D. at the non homologous chromosome
Answer : Option C
29. what is called pleiotropism ?
A. Phenomenon of multiple effect of a simple gene
B. Phenomenon of multiple effect of multiple genes
C. Phenomenon of multiple effect of multiple alleles
D. all of the above
Answer : Option A
30. In a family, father has a blood group 'A' and mother has a blood group 'B', Children show 50 % probability for a blood group "AB" indicate that -
A. Father is heterozygous
B. Mother is heterozygous
C. Either of parent is heterozygous
D. Mother is homozygous
Answer : Option C