How does speciation occur ?
by mutation
by reproductive isolation
by natural selection
by independent assortment
The recessive character in Mendel's pea plant was
yellow pod
round seed
green pod
axial flower
Which of the following causes mutation ?
X-rays
Colchicine
Cosmic rays
Crossing over
If a cross between two plants give 50% tall and 50% dwarf progeny, then the parents genotypes are
Tt x Tt
Tt x tt
TT x tt
TT x Tt
Normally a test cross is meant to
Test the genotype.
Test the dominant alleles.
Test the phenotype.
Test the crossing over.
'Mutation theory of evolution' was given by
Helmont
Pasteur
Haldane
Hugo de Vries
Who proposed the theory of natural selection along with Charles Darwin ?
Muller
Herbert Spencer
Alfred R. Wallace
Chromosomes are made up of
proteins
DNA
both (1) and (2)
RNA
An externally observable characters of an individual are called
phenotype
genotype
homozygous
heterozygous
Which of the following is a recessive trait in garden pea ?
Tall stem
Round seeds
Wrinkled seeds
Coloured seed coat
