Mendel's work on Pisum sativum shows that 

1.  Alleles show blending inheritance 

2.  ${\mathrm{F}}_1$ resembled either of the two parents

3.  In a dissimilar pair of factors, members of the pair are codominant

4.  Genotype of ${\mathrm{F}}_2$ 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 

What is correct for AB blood group system?

a.  The effect of both alleles of a gene is equally expressed.

b.  Produces an intermediate phenotypic effect.

c.  The blending of both alleles occurs.

d.  There is no intermediate phenotypic effect.

1.  a, c, d

2.  a, b, c

3.  a, d

4.  b. c 

How many diseases in the list given below are Mendelian disorders?

1.  Four

2.  Five

3.  Six

4.  Seven 

Read the following four statements (A-D)

A.  The characters never blend in heterozygous condition.

B.  Change in a single base pair of DNA does not cause mutation.

C.  Cancer cells commonly show chromosomal aberrations.

D.  In chicken, sex chromosomes in males are ZW and in females are ZZ.

How many of the above statements is/are right?

1.  Two

2.  Three

3.  Four

4.  One 

Which of the following pair is wrongly matched?

1.  Factors   -   Discrete units

2.  Multiple alleles  -  ABO blood group

3.  Female Drosophila  -  Heterogametic

4.  Inborn error   -   Phenylketonuria

Morgan observed tight linkage in Drosophila with only 1.3 percent recombination for

1.  White eye and yellow body

2.  Normal wing and yellow body

3.  White eye and miniature wing

4.  Yellow body and miniature wing 

Morgan coined the term recombination to describe 

1.  Physical association of genes on a chromosome

2.  Generation of new traits by mutation

3.  Linkage of two genes on different chromosomes

4.  Generation of non-parental gene combinations 

Which of the following is a non-parental type of progeny obtained by Morgan while carrying out a dihybrid cross?

1.  

2.  

3.  

4.  

What percent of 'ab' type of gamete produced by a pea plant of genotype AaBb?

1. 25%

2. 50%

3. 75%

4. 100%