Analyse the causes and influence of big five mass extinctions
See Answer →Distinguish the terms interspecifc sterility and hybrid sterility.
See Answer →Discuss the role played by courtship behavior and scents in the isolation process
See Answer →Cite an example to show that highly restricted breeding seasons of populations contribute to isolation process.
See Answer →How does habitat preference of organisms promote speciation process?
See Answer →Explain the concept of geographical isolation with suitable examples.
See Answer →What is Isolation and what are its types? Explain.
See Answer →What do you understand by sexual selection. Illustrate your answer with a suitable example
See Answer →Industrial melanism is an excellent model to demonstrate the natural selection in action. Analyse the above statement critically.
See Answer →Explain Neo Darwinism and Neo Lamarckism in detail
See Answer →What are transposable genetic elements? How they can cause mutations?
See Answer →Define mutation. Explain the following types of mutations briefly:
(a) Induced mutations
(b) Supperessor mutations
What is trisomy? By what mechanisms does it come into existence
See Answer →Explain why sterility is common in polyploid organisms?
See Answer →Which among the following statements are correct?
i) Mitochondria contain 80 S ribosomes.
ii) The mRNA encoded by nuclear genes for the smaller subunit
of rubisco is translated in the chloroplast.
iii) The inheritance of chloroplast genome is independent of
nuclear genome.
In the following statements choose the alternate correct word given
in parenthesis.
i) The DNA regions in chloroplast could be observed under
(light microscope/electron microscope).
ii) The regions containing cpDNA are called
(nucleoids/celluloids).
iii) Each nucleoid contains (a single/a few) copies of DNA.
iv) The cpDNA and mtDNA are usually (circular/linear) in nature.
v) Both chloroplast and mitochondria contain (a few/many)
copies of DNA.
vi) The mtDNA of yeast is (bigger/smaller) than mtDNA of
humans.
vii) The occurrence of introns is discovered in (yeast/human).
Two recessive genes ds and mp are present in corn. These are linked and are 20 map units apart. From the cross:
What percentage of the progeny would be expected to be both ds and mp in the phenotype?
See Answer → In Drosophila, the recessive, sex-linked genes abnormal eyes facet
(fa) and singed bristles (sn) show 18 percent recombination.
a) If a singed male is crossed to afafa female, what phenotypes
are expected in the F1?
b) If the F1 males and females are inbred what phenotypic
proportions would be expected to occur in F2 males and
females?
Explain the phenomenon of masking the expression of gene by another in epitasis.
See Answer →How is co-dominance different from incomplete dominance?
See Answer →