Linkage & Crosing over (NEET/AIIMS OnlIne Practice Exam)

Crossing Over occurs when the homologous chromosomes contain
1. One chromatid
2. Two chromatid
3. Four chromatid
4. Eight chromatid
The genes located on the same Chromosome that are inherited together are known as
1. Complementary genes
2. Supplementary genes
3. Mutant genes
4. Linked genes
Linkage usually gets broken due to
1. Mutation
2. Cross over
3. Epistasis
4. Variation
Coupling and repulsion are experimented on fruit fly by
1. Bateson
2. Morgan
3. Punnet
4. Sinnot
The tendency of two different genes to remain apart if they come from two different parents is
1. Coupling
2. Repulsion
3. Linkage
4. Crossing over
Due to linkage in maize, the number of colourless shrunken seeds produced are
1. 4032
2. 4035
3. 149
4. 152
Due to linkage in maize, the number of coloured shrunken seeds produced are
1. 4032
2. 4035
3. 149
4. 152
The scientists who proved that Mendel’s law of independent assortment is not universal
1. Morgan and Mendel
2. Correns and Tschermak
3. Bateson and Punnet
4. Sinnot and Punnet
The genotype of colourless shrunken seeds in maize is
1. CcSs
2. ccss
3. Ccss
4. ccSs
The number of Chromosomal pairs in Drosophila melanogaster is
1. 1 pair
2. 2 pair
3. 3 pair
4. 4 pair
Pairing of homologous chromosomes is called
1. Terminalisation
2. Linkage
3. Crossing over
4. Synapsis
Linkage is maize was reported by
1. Bateson
2. Morgan
3. Hutchinson
4. Sinnot
When two different genes come from the same parent they tend to remain together is called
1. Coupling
2. Repulsion
3. Linkage
4. Crossing over
In maize the genotype of colourless full seeds in
1. CcSs
2. Ccss
3. ccSs
4. ccss
Homologous chromosomes exchange corresponding segments between non-sister chromatids during
1. Linkage
2. Crossing Over
3. Mutation
4. Epistasis
During crossing over, exchange of chromosomal or genetic material takes place between
1. two chromatids
2. two chromosomes
3. two non-sister chromatids of each tetrad
4. two sister
Linkage is clear in
1. Paddy
2. Maize
3. Snapdragon
4. Sweet pea
Linkage is usually
1. Complete
2. Incomplete
3. Intermediate
4. Full
Coupling and repulsion are two aspects of same phenomenon called
1. Linkage
2. Crossing over
3. Evolution
4. Variation
The scientist who considered that the genes carried on the same chromosome remain linked as a group and are transmitted together through the gametes to the offspring:-
1. Hutchinson
2. Bateson
3. Morgan
4. Correns
Recombination of linked genes is accomplished by
1. Linkage
2. Epistasis
3. Mutation
4. Cross over
The ratio obtained by Bateson and Punnet when they test crossed second time between blue long and red round in sweet pea
1. 7:1:1:7
2. 1:1:1:1
3. 1:7:7:1
4. 9:3:3:1
The scientist who discovered that coupling and repulsion are two aspects of a single phenomenon called linkage is
1. Bateson
2. Mendel
3. Morgan
4. Punnet
In maize parental and recombinations are produced in the ratio of
1. 50:50
2. 9:7
3. 96.4:3.6
4. 1:7:7:1
In maize the genotype of coloured full seeds is
1. CcSs
2. Ccss
3. ccSs
4. ccss
The adjacent non-sister chromatid remain in contact at certain points called
1. Locus
2. Chiasmata
3. Linkage
4. Coupling
Genes located on the same Chromosome do not separate independently because of
1. Crossing over
2. Linkage
3. Mutation
4. Factors interaction
The ratio observed by Bateson and Punnet when they test crossed in sweet pea between BbLl and bbll was
1. 9:3:3:1
2. 9:7
3. 7:1:1:7
4. 12:3:1
The mechanism that provides the basis for new varieties of plant is
1. Linkage
2. Crossing over
3. Epistasis
4. Repulsion
Mutation helps for
1. evolution
2. cell division
3. fertilization
4. protein synthesis
The phenomenon in which genes are present on the same chromosomes is:
1. Cross over
2. Segregation
3. Linkage
4. assortment
The linked gene does not follow:
1. Cross over
2. Segregation
3. Linkage
4. assortment
The linkage groups in man are:
1. 46
2. 23
3. 22
4. 24
The linkage group of sickle cell anemia, leukemia and albinism is present on chromosome:
1. 10
2. 11
3. 12
4. 13
The gene linkage minimize the chances of:
1. Cross over
2. Segregation
3. recombination
4. assortment
Gene A and B are linked gene. Which of following gametes show recombination?
1. AB
2. ab
3. Ab
4. ab
There is 30% recombination frequency between two genes. The distance between them in unit map is:
1. 15
2. 30
3. 60
4. 80
There are 80% parental and 20% recombinant in a cross. Its recombinant frequency is:
1. 10%
2. 20%
3. 40%
4. 80%
The twins developed from same fertilized egg, due to breaking after first or few cleavages, having same genotype and sex.
1. Dizygotic Fraternal twins
2. Monozygotic twins
3. Siamese twins
4. Parasitic twins
Strength of the linkage is _______ proportional to the distance between two linked genes.
1. directly
2. positively
3. negatively
4. inversely
Linked genes show a phenotypic dihybrid ratio of:
1. 1 : 2 : 1
2. 9 : 3 : 3 : 1
3. 3 : 1
4. 1 : 2
The maximum recombination frequency that two genes on same chromosome may have is:
1. 25%
2. 50%
3. 75%
4. 100%
Haemophilia is an example of:
1. Complete linkage
2. Incomplete linkage
3. Complete sex linkage
4. Incomplete sex linkage
Retinitis pigmentosa is an example of:
1. Complete linkage
2. Incomplete linkage
3. Complete sex linkage
4. Incomplete sex linkage
Nephritis is an example of:
1. Complete linkage
2. Incomplete linkage
3. Complete sex linkage
4. Incomplete sex linkage
The number of linkage groups in Pea:
1. 7
2. 4
3. 10
4. 23
The number of linkage groups in Drosophila:
1. 7
2. 4
3. 10
4. 23
The number of linkage groups in Maize:
1. 7
2. 4
3. 10
4. 23
Crossing over of genes takes place at
1. Telomere
2. Chromatids
3. Chiasmata
4. Nucleosome
Frequency of Crossing-over is ______ the frequency of recombinants
1. Half
2. double
3. triple
4. four times

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Linkage & Crosing over (NEET/AIIMS OnlIne Practice Exam)

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