The fruit fly, Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because

• It reproduces parthenogenetically

• a single mating produces two young files

• smaller female is easily recognisable from larger male

• smaller female is easily recognisable from larger male

In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (A-D) in the regard and select the correct option about which one or more of these can be used as a vector/vectors
A) A bacterium
B) Plasmid
C) Plasmodium
D) Bacteriophage

• A, B and D only

• A only

• A and C only

• A and C only

Which one of the following statements about the particular entity is true?

• Centromere is found in animal cell which produces ester during cell divison

• the gene for producing insulin is present in every body cell

• Nucleosome is formed of nucleotides

• Nucleosome is formed of nucleotides

Select the correct statement from the ones given below with respect to dihybrid cross. 

• Tightly linked genes on the same chromosome show higher recombinations

• Genes far apart on the same chromosome show very few recombinations

• Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.

• Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.