71.

A disease caused by an autosomal primary non-disjunction is

• Down's syndrome

• Klinefelter's syndrome

• Turner's syndrome

• Turner's syndrome

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

• 1

• 11

• 33

• 33

A gene whose expression helps to identify transformed cell is known as

• Selectable marker

• Vector

• Plasmid

• Plasmid

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

• Tropical Savannah

• Tropical Rain Forest

• Grassland

• Grassland

The genotypes of a Husband and Wife are I^AI^B and I^Ai. Among the blood types of their children, how many different genotypes and phenotypes are possible?

• 3 genotypes ; 3 phenotypes

• 3 genotypes ; 4 phenotypes

• 4 genotypes ; 3 phenotypes

• 4 genotypes ; 3 phenotypes

Which of the following is correctly matched for the product produced by them?

• Acetobacter aceti : Antibiotics

• Methanobterium : Lactic acid

• Penicillium notatum : Acetic acid

• Penicillium notatum : Acetic acid

Asymptote in a logistic growth curve is obtained when

• The value of 'r' approaches zero

• K = N

• K > N

• K > N

The DNA fragments separated on an agarose gel can be visualised after staining with

• Bromophenol blue

• Acetocarmine

• Aniline blue

• Aniline blue

Functional megaspore in an angiosperm develops into

• Ovule

• Endosperm

• Embryo sac

• Embryo sac

Among the following characters, which one was not considered by Mendel in his experiments on pea?

• Stem – Tall or Dwarf

• Trichomes – Glandular or non-glandular

• Seed – Green or Yellow

• Seed – Green or Yellow