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TLS Online TPP Program

#Question id: 13207

The polymer-trapping model explains symplastic loading in plants with intermediary-type companion cells, this model makes three prediction; which one of the following prediction is INCORRECT?

#Unit 6. System Physiology – Plant
  1. Sucrose should be more concentrated in the mesophyll than in the intermediary cells
  2. The enzymes for raffinose and stachyose synthesis should be preferentially located in the intermediary cells
  3. The plasmodesmata linking the bundle sheath cells and the intermediary cells should exclude molecules larger than sucrose
  4. Plasmodesmata between the intermediary cells and sieve elements must be smaller donot allow passage of raffinose and stachyose
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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
TLS Online TPP Program

#Question id: 13145

#Unit 8. Inheritance Biology

We can construct a genetic map by considering the recombination frequencies for each pair of genes. The recombination frequency between a and b is 50%, a and c is 50%, and b and c is 20%. What will be the correct prediction about this statements;
a)  Recombination frequency between genes a and b and gene a and c is expected with independent assortment
b) The genes a and b and gene a and c may either be on different chromosomes or be very far apart on the same chromosome;  so we will place them in different linkage groups
c) The gene b and c are linked
d) The gene b and c are unlinked
Which of the following is the correct sequence?
TLS Online TPP Program

#Question id: 13005

#Unit 8. Inheritance Biology

50 meiocytes with the genotype AaBb has 5% recombinational frequency in their gametes A and B, then how many meiocytes undergoes to the single crossing over ?