Class 12 Biology: Principles of Inheritance and Variation
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Q1 · MCQ · 1 mark
Which of the following is an example of incomplete dominance?
Q2 · MCQ · 1 mark
If a dihybrid cross is performed between two heterozygous individuals (AaBb x AaBb), what will be the phenotypic ratio in the F2 generation?
Q3 · FILL · 1 mark
The phenotypic expression of all the genes present in an individual is called its ____.
Q4 · MCQ · 1 mark
Turner’s syndrome is caused by the loss of a ____ chromosome.
Q5 · SHORT · 2 marks
Distinguish between a test cross and a back cross.
Q6 · MCQ · 1 mark
A character that is expressed in both homozygous and heterozygous conditions is called:
Q7 · FILL · 1 mark
The inheritance of ABO blood groups in humans is an example of ____ and ____.
Q8 · SHORT · 2 marks
What is pleiotropy? Give one example.
Q9 · FILL · 1 mark
When two genes on the same chromosome are very close to each other, they show a low frequency of ____.
Q10 · MCQ · 1 mark
The chromosomal disorder where an individual has XXY sex chromosomes is known as: