Some individuals with blood group A may inherit the genes for blond hair, while other individuals with blood group A may inherit the gene for brown hair. This can be best explained by the principle of
dominance
multiple alleles
independent assortment
incomplete dominance
Which one of the follwoing cannot be explained on the basis of Mendel's Law Dominance ?
The discrete unit controlling a particular character is called a factor
Out of one pair of factors one is dominant, and the other is recessive
Alleles do not show any blending and both the characters recover as such in F2 generation
Factors occur in pairs
Genes are made up of
histones
hydrocarbons
polynucleotides
lipoproteins
The gene, which controls many characters is called
codominant gene
poly gene
pleiotropic gene
multiple gene
Genes exhibiting multiple effects are known as
complementary genes
pleiotropic genes
cistrons
pseudogenes
The F2 genotypic ratio of monohybrid cross is
1 : 1
1 : 2 : 1
2:1:2
9:3:3:1
In garden pea , yellow colour of cotyledons is dominant over green and round shape of seed is dominant over wrinkled. When a plant with yellow and round seeds is crossed with a plant having yellow and wrinkled seeds, the progeny showed segregation for all the four characters. The probability of obtaining green round seeds in the progeny of this cross is .
1/4
1/8
1/16
3/16
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
