Multiple Choice QuestionsPrimary source of allelic variation is
independent assortment
recombination
mutation
polyploidy
B.
recombination
Recombination is the natural process of breaking and rejoining DNA strands to produce new combination of genes and, thus, generate genetic variation. This is the phenomenon which occur during meiosis I.
Independent Assortment is one of the law of Mendel. It states thats when two or more characteristics are inherited, individual hereditary factors assort independently during gamete production, giving different traits an equal opportunity of occurring together.
Mutation is the alteration in the genetic material by physical or chemical changes.
Polyploidy is a state of a cell or organism having more than two homologous paired sets of chromosomes.
In which one of the following would you expect to find glyoxysomes?
Endosperm of wheat
Endosperm of castor
Palisade cells in leaf
Root hairs
Which one of the following correctly represents an organism and its ecological niche?
Vallisneria and pond
Desert locust (Scistocerca) and desert
Plant lice (aphids) and leaf
Vultures and dense forest
Given below is one of the types pyramids.
This type represents
pyramid of numbers in a grassland
pyramid of biomass in a fallow land
pyramid of biomass in a lake
energy pyramid in a spring
Somaclonal variation appears in
organisms produced through somatic hybridization
plants growing in highly polluted conditions
apomictic plants
tissue culture raised plants
cDNA probes are copied from the messenger RNA molecules with the help of
restriction enzymes
reverse transcriptase
DNA polymerase
adenosine deaminase
Double fertilization involves
fertilization of the egg by two male gametes
fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube
fertilization of the egg and the central cell by two sperms brought by different pollen tubes
fertilization of the egg and the central cell by two sperms brought by the same pollen tube.
Assertion : In recombinant DNA technology, human genes are often transferred into bacteria (prokaryotes) or yeast (eukaryote).
Reason : Both bacteria and yeast multiply very fast to form huge populations which express the desired gene.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false.
If both Assertion and Reason are false
Assertion : A suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason : Catalytic converters greatly reduce pollution caused by automobiles.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false.
If both Assertion and Reason are false
Assertion : Methane component of green house gases contributing to global warming is about 20 percent.
Reason : Introduction of multi-point fuel injection engines in automobiles has decreased methane content in the exhausts.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
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