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The cross between recessive homozygous parents and F1 individual gives only one type of results, i.e.,

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Important Questions on Principles of Inheritance and Variation

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Alleles are:
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
How will you find that F1 Hybrid is homozygous or heterozygous? Explain it with suitable example.
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A homozygous tall pea plant is crossed with its homozygous recessive parent. Find out the genotypic and phenotypic ratio with the help of Punnet square method.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene

Match the following lists:

  List - I   List - II
(A) Back cross   It is the genetic make up of an individual.
(B) Test cross (II) An individual is having two different alleles for a single character. Consequently, it will produce two different types of gametes with reference to a gene.
(C) Heterozygote (III) An individual is having two similar or identical alleles for a single character. Hence, it will produce only one kind of gametes with reference to a gene.
(D) Homozygote (IV) If the F1 progeny are mated back to one of their parents.
    (V) The cross between F1 progeny (or heterozygotes) and their recessive homozygous parent.

The correct match is:

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene

A round seeded tall pea plant is crossed with round seeded dwarf plant and obtained progeny are with following phenotypes
3 - Tall, Round
3 - Dwarf, Round
1 - Tall, Wrinkled
1 - Dwarf, Wrinkled

The possible genotype of parents:

EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
According to Mendel, ........................ segregate and ..................... assort independently.
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Identify which one of the following is a test cross.
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
How many types of gametes can be produced by individual with the genotype AAbb?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Some of F2 progeny are formed during dihybrid cross between round and yellow o↑ and wrinkled and green +∘ pea plants. Their genotypes are:
HARD
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A cross wạs carried out between two individuals, heterozygous for two pairs of genes. Assuming segregation and independent assortment, the number of different genotypes and phenotypes obtained respectively would be
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
If the gene pool of the locus X in the human genome is 4, then what would be the highest possible number of genotypes in a large population?
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
In human beings, brown eye (B) is dominant over blue eye (b). A brown-eyed couple has a blue-eyed child. What are the possible genotypes of the couple?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Monohybrid cross is a cross of ________.
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Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A true breeding plant is:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
If F1 hybrid shows characters of both the parents, then it is due to
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
Assertion (A): Two copies of the gene are the two allelic forms of which, one allele produces a non-functional enzyme.
Reason (R): The modified allele is generally the recessive allele.
The correct option among the following is:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
The production of gametes by the parents, formation of zygotes, the F1 and F2  plants, can be understood from a diagram called:
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
The maximum number of different gametes of the pollens produced by a tall pea plant with round, yellow, seeds of the genotype TtRrYY, if the three loci are unlinked, would be
MEDIUM
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
What is the possible genotypic ratio in F2 generation if a plant producing red flowers RR is crossed with another plant of the same species that produces white flowers rr?
EASY
Biology>Genetics and Evolution>Principles of Inheritance and Variation>Inheritance of One Gene
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio