Inheritance of 'ABO' blood group shows
polyploidy
incomplete dominance
multiple allelism
polygeny
Mendel's principle of segregation means that the germ cells always receive
one pair of alleles
one quarter of the genes
one of the paired alleles
any pair of alleles
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
Lack of independent assortment of two genes 'A' and 'B' in fruit fly - Drosophila is due to
repulsion
recombination
linkage
crossing over
The genotype of a plant showing the dominant phenotype can be determined by
test cross
dihybrid cross
pedigree analysis
back cross
How many pairs of contrasting characters in pea pod were chosen by Mendel?
3
5
7
9
When different alleles of the same gene are present on an individual, the individual is a
heterozygous
diploid
homozygous
mosaic
Which of the following animals is mostly used in genetic experiments?
Butterfly
Fruit fly
Housefly
Dragon fly
Alleles are
alternate forms of a gene
homologous chromosome
pair of sex chromosome
none of the above
Multiple phenotype seen in
pleiotropy
polygenic inheritance
