The phenotype of an individual may be affected if the modified allele produces

A.  The normal/less efficient enzyme

B.  No enzyme at all

C.  A non-functional enzyme

1.  Only A is correct 

2.  Only C & A are correct

3.  Only B is correct

4.  B & C are correct 

Ability of a gene to have multiple phenotypic effects is known as

1.  Co-dominance 

2.  Pleiotropy

3.  Multiple allelism

4.  Incomplete dominance 

Morgan and his group observed when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type, this is due to

1.  Independent assortment 

2.  Linkage

3.  Crossing over

4.  Competence 

What is probability of homozygous individuals for both characters in ${\mathrm{F}}_2$ generation of a dihybrid cross?

1.  1/2

2.  3/4

3.  1/3

4.  1/4 

Choose correct option with respect to given figure for determination of sex by chromosomal differences.

1.  b after spermatogenesis forms only one type of gametes

2.  b & c represents same sex

3.  a, d are heterogametic

4.  Sex determination in d is similar to grasshopper 

Which one of the following statement is incorrect?

The figure below shows the chromosome segregation during germ cells formation with four stages labelled as (A), (B), (C) and (D). Select the right option giving all the four stages correctly identified

1.  (A) Interphase            (B) Metaphase-l
     (C) Telophase-l           (D) Anaphase-ll

2.  (A) ${\mathrm{G}}_1$                        (B) ${\mathrm{G}}_2$
     (C) Anaphase-l            (D) Anaphase-ll

3.  (A) ${\mathrm{G}}_1$                        (B) ${\mathrm{G}}_2$
     (C) Metaphase-l           (D) Anaphase-l

4.  (A) ${\mathrm{G}}_1$                         (B) ${\mathrm{G}}_2$
    (C) Anaphase-l              (D) Metaphase-ll

Males are heterogametic and females are homogametic in

1.  Human beings and birds

2.  Fruit fly and butter fly

3.  Grasshopper and cockroach

4.  Birds and silkworm 

Mendel's work on Pisum sativum shows that 
1.  Alleles show blending inheritance 
2. Equal proportion of F₁ resembled either of the two parents
3.  In a dissimilar pair of factors, members of the pair are codominant
4.  Genotype of F2 tall plant can be determined by cross with recessive parent

In the pedigree analysis, the meaning of the symbol  is 

1.  Still birth

2.  Dizygotic twin

3.  Mating between relatives

4.  Sex unspecified