Lack of independent assortment of two genes 'A' and 'B' in fruit fly - Drosophila is due to
repulsion
recombination
linkage
crossing over
A polygenic trait is controlled by 3 genes A, B and C. In a cross AaBbCc × AaBbCcm, the phenotypic ratio of the offsprings was observed as 1: 6 : x : 20 : x : 6 : 1.
3
9
15
25
Genetic counselors can identify heterozygous individuals by
height of individuals
colour of individuals
screening procedures
All of these
Mendel was successful in discovering the principle of inheritance as
he took pea plants for his experiments
he did not encounter linkage between the genes for the characters he considered
he had an in-depth knowledge on hybridization
he was a famous mathematician
The term 'Genetics' was proposed by
Mendel
Bateson
Morgan
Johanssen
Allelism refers to
genic interactions controlling a character
multiple genes controlling a character
expression of many characters by a single gene
alternative forms of a gene at a given locus
Which of the following animals is mostly used in genetic experiments?
Butterfly
Fruit fly
Housefly
Dragon fly
If two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured flowers will be.
both homozygous
one homozygous and other heterozygous
both heterozygous
both hemizygous
When different alleles of the same gene are present on an individual, the individual is a
heterozygous
diploid
homozygous
mosaic
Genes are made up of
histones
hydrocarbons
polynucleotides
lipoproteins
