In Mendel’s dihybrid cross, maximum number of phenotype in F2 generation was —
Anonymous Quiz
16%
Wrinkled green
53%
Round yellow
21%
Wrinkled yellow
10%
Round green
Physical appearance of characters is called —
Anonymous Quiz
12%
Karyotype
64%
Phenotype
14%
Homozygous
11%
Genotype
Given below are two statements:
Statement I: A cross of a pea plant with yellow and round seeds and one with green and wrinkled seeds is a monohybrid cross.
Statement II: The phenotypic ratio of a dihybrid cross is 9:3:3:1
Statement I: A cross of a pea plant with yellow and round seeds and one with green and wrinkled seeds is a monohybrid cross.
Statement II: The phenotypic ratio of a dihybrid cross is 9:3:3:1
Anonymous Quiz
31%
Both statement I and II are correct
28%
Both statement I and II are incorrect
23%
Statement I is correct and statement II is incorrect
19%
Statement I is incorrect and statement II correct
👍1
Assertion (A): In Mendel’s study of inheritance of two genes, green colour was dominant over yellow and wrinkled shape dominant over round.
Reason (R): rrYy denotes wrinkled yellow phenotype.
Reason (R): rrYy denotes wrinkled yellow phenotype.
Anonymous Quiz
30%
Both A and R are true and R is the correct explanation of A
38%
Both A and R are true but R is not the correct explanation of A
14%
A is true but R is false
18%
A is false but R is true
The phenotypic ratio of Mendel’s dihybrid cross of F2 generation was
Anonymous Quiz
15%
3:1
17%
10:1
64%
9:3:3:1
4%
2:1
❤1
The trait chosen by Mendel for studying inheritance by two genes was
Anonymous Quiz
20%
Stem height and flower colour
52%
Seed shape and seed colour
17%
Flower colour and flower position
11%
Pod colour and pod shape
❤1
What was the phenotype of the F1 generation when Mendel crossed round yellow and wrinkled green seeds?
Anonymous Quiz
16%
All wrinkled green
54%
50% wrinkled and 50% green
18%
All round yellow
12%
50% round and 50% yellow
❤1
How many types of gametes will be produced by an organism having genotype RrYy?
Anonymous Quiz
14%
40
53%
4
23%
20
11%
2
❤1
When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters. This is —
Anonymous Quiz
18%
Law of dominance
40%
Law of segregation
37%
Law of Independent assortment
5%
None of the above
❤1🤗1
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What are the harmful effects of UV-B radiation?
Anonymous Quiz
13%
Causes aging of skin
25%
Damages the skin cells
18%
Causes skin cancers
44%
All of the above
❤1
In human eye ________ absorbs UV-B radiation.
Anonymous Quiz
24%
Iris
23%
Choroid
40%
Retina
13%
Cornea
Which of the following was signed to control the emission of ozone depleting substances?
Anonymous Quiz
33%
The Earth Summit
35%
The World’s Summit
23%
The Montreal Protocol
9%
None of the above
Irrigation without proper drainage of water leads to
Anonymous Quiz
12%
Choking of drains
31%
Solidification of water
20%
Waterlogging in the soil
37%
All of the above
This process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography is
Anonymous Quiz
9%
Saltation
30%
Mutation
48%
Adaptive radiation
13%
Branching descent
❤1
Evolution of different species in one area from a single ancestor and spreading to other areas is called:
Anonymous Quiz
7%
Saltation
27%
Mutation
53%
Adaptive radiation
12%
Branching descent
Which statements are correct?
(1) Darwin’s theory = natural selection
(2) Branching descent + natural selection = key concepts
(1) Darwin’s theory = natural selection
(2) Branching descent + natural selection = key concepts
Anonymous Quiz
20%
(1) only
26%
(2) only
51%
(1) and (2)
3%
None