MEDIUM
10th CBSE
IMPORTANT
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In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is

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Important Questions on Heredity and Evolution

EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 23
The number of pairs of sex chromosomes in the zygote of humans is 
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 24
The theory of evolution of species by natural selection was given by
HARD
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 25
Some dinosaurs had feathers although they could not fly, but birds have feathers that help them to fly. In the context of evolution, this means that
MEDIUM
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 1
A pure tall plant can be differentiated from a hybrid tall plant
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 2
The ratio of phenotype in F2 generation of a dihybrid cross is
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 3
Alternative forms of a gene are called
MEDIUM
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 4
Which of these is homozygous recessive?
MEDIUM
10th CBSE
IMPORTANT
Eduwiser's CBSE BIOLOGY For Class X>Chapter 4 - Heredity and Evolution>EXERCISE>Q 5
Heterozygous tall plants were crossed with dwarf plants, what will be the ratio of dwarf plants in the progeny?