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Published on: 28/08/2019
Principles of Inheritance and Variation
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test
1.
What was the most significant conclusion that Mendel drew from his experiments?
2.
What term did Mendel give to what we call genes today?
3.
How many true-breeding varieties of garden pea did Mendel select for starting his experiments?
4.
Why, in a test cross did Mental cross a tall pea plant with a dwarf pea plant only?
5.
Write the possible genotypes Mental got when crossed F1 tall pea plant with a dwarf pea plant
6.
Colour blindness is a recessive sex-linked trait in which the eye fails to distinguish
Red and green colours
Red and yellow colours
Green and blue colours
7.
By which process there is a gain o segment of DNA which results in alteration in chromosome?
Insertion
Duplication
Both a and b
Deletion
8.
The recessive genes located on X-chromosome in humans are always
sub-lethal
expressed in males
expressed in females
lethal
9.
A self-fertilizing trihybrid plant forms
4 different gametes and 16 different zygotes
8 different gametes and 16 different zygotes
8 different gametes and 32 different zygotes
8 different gametes and 64 different zygotes
10.
In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt
50% will be tall with red fruit
75% will be tall with red fruit
all the offspring will be tall with red fruit
25% will be tall with red fruit
1.
( )
Traits are inherited as discrete units, one from each parent.
2.
( )
Factors.
3.
( )
Fourteen or seven pairs.
4.
( )
Dwarfess is a recessive trait which is expressed only in homozygous condition; so he was sure of the genotype of the dwarf plant as tt
5.
( )
tt and tt (in the ratio 1:1)
6.
(a)
Red and green colours
7.
(c)
Both a and b
8.
(c)
expressed in females
9.
(d)
8 different gametes and 64 different zygotes
10.
(b)
75% will be tall with red fruit
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