Principles of Inheritance and Variation — Class 12 Biology PYQs

Mention the possible genotype of 'O' blood group in humans.
[Max Marks: 1 | Sets: 57/2/3]

If both parents are heterozygous for colour blindness, the offspring would be :
[Max Marks: 1 | Sets: 57/2/1]

In a monohybrid cross, when F1 individuals are allowed to interbreed, the recessive phenotype reappears in F2. What is the proportion of organisms having the dominant phenotype but being heterozygous in the F2 generation ?
[Max Marks: 1 | Sets: 57/2/3]

A couple where both male and female are normal shows a family history of haemophilia. It is safer to advice that they would produce a/an :
[Max Marks: 1 | Sets: 57/1/2]

According to Mendel's law of dominance :
[Max Marks: 1 | Sets: 57/1/1]

Which one of the following represents genotypes of two plants independently showing 3 : 1 ratio ?
[Max Marks: 1 | Sets: 57/1/3]

Which one of the following represents the genotypes of a tall plant and a dwarf plant exhibiting independent assortment ?
[Max Marks: 1 | Sets: 57/2/2]

When a pink flower Four O' Clock plant is crossed with white flower plant, the progeny contains only pink coloured flowers. This is a case of :
[Max Marks: 1 | Sets: 57/2/1]

An organism with genotype AaBBCcDD is self-pollinated. How many phenotypes are possible in the progeny ?
[Max Marks: 1 | Sets: 57/1/2]

A cross between two pea plants, tall with round seeds (TtRr) and dwarf with wrinkled seeds (ttrr), results into four phenotypic classes. Which one of the following cannot be one of them ?
[Max Marks: 1 | Sets: 57/1/3]