Practice Questions

TLS Online TPP Program

#Question id: 12327

Which of the following is the most accepted hypothesis as to why invasive species take over communities into which they have been introduced?

#Unit 10. Ecological Principles

Invasive species are more aggressive than natives in competing for the limited resources of the environment.
Invasive species are not held in check by the predators and agents of disease that have always been in place for the natives.
Humans always select which species will outcompete the nuisance native species.
Invasive species have a higher reproductive potential than native species.

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TLS Online TPP Program

#Question id: 13151

#Unit 8. Inheritance Biology

A series of two-point crosses were carried out among five loci (a, b, c, d and e) producing the following recombination frequencies. Using these recombination frequencies, map these five loci, showing their linkage groups, the order of the loci in each linkage group is;

What is the correct order of the loci?

TLS Online TPP Program

#Question id: 13150

#Unit 8. Inheritance Biology

A fruit fly Drosophila melanogaster showing three point test cross st+-e+-ss+ was crossed with triplet recessive mutant st-e-ss. The F1 hybrid was the backcross with the recessive mutant and the phenotype recorded as follows;

The distance in map unit (mu) between st+ to e+ and e+ to ss+ is

TLS Online TPP Program

#Question id: 13149

#Unit 8. Inheritance Biology

A three point test cross was made between the st^+-e^+-ss^+ and st-e-ss , the genotype of the double cross over will be; st^+-e-ss^+ and st-e^+-ss. Based on this, determine the order of the genes.

TLS Online TPP Program

#Question id: 13148

#Unit 8. Inheritance Biology

During a three point test cross is carried out. The parental cross was AABBCC X aabbcc , the F1 progeny is AaBbCc. What will be the no. of given genotype in 100 progeny?

i) AaBbCc ii) aaBbcc

TLS Online TPP Program

#Question id: 13147

#Unit 8. Inheritance Biology

A cross was made between pure Blue and long pollen length with white and short pollen length. The F1 were test crossed. The F2 progeny obtained was as follows:

The genetic distance (cM) between flower colour and pollen length is;

TLS Online TPP Program

#Question id: 13146

#Unit 8. Inheritance Biology

Two gene A and B gene distance is 30 m.u. if the frequency of the given gametes is,

i) AaBb=0.70 ii) Aabb=0.30

What will be the correct prediction?

a) Genes a and b are linked in cis

b) A and B gene are independently assort

c) Gene a and b showing incomplete linkage

d) Genes a and b are linked in trans