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TLS Online TPP Program

#Question id: 13129

Biologists performed an experiment with flies to examine the effects of population size on the maintenance of genetic variation  and  on  egg-to-adult survival.  From  a  large  source  population, they  randomly  assigned  eggs  to  three experimental  populations  of  size  N,  equal  to  20,  60,  and0100.  For  later  generations,  they  collected  N  eggs  from each  population  and  moved  them  into  identical  vials  that  co0ntained  f2re0sh  me4d0ium.  Th6e0y  coun8te0d  the  number  of adult flies that emerged and used tissue samples from the adults for genetic analyses. Genetic variation was measured by  scoring  alleles  at  several  polymorphic  loci  and  expressed  as  the  average  number  of  alleles  at  those  loci.  The results are summarized in Figure 1 and Figure 2 below.

Based on Figure 1, which of the following best describes the change in genetic variation over time? 

#Unit 10. Ecological Principles
  1. It increased in all three populations.
  2. It was unchanged in the largest population and increased in the two smaller populations. 
  3. It was unchanged in all three populations.
  4. It was unchanged in the two larger populations and declined in the smallest population.
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TLS Online TPP Program

#Question id: 12027

#Unit 7. System Physiology – Animal

If you place a small piece of a cracker on your tongue, what would you expect to happen?
TLS Online TPP Program

#Question id: 12995

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following constraints affect the stability α-helix, 
a) the intrinsic propensity of an amino acid residue to form an α-helix.
b) the interactions between R groups.
c) the bulkiness of adjacent R groups.
d) the occurrence of Pro and Gly residues.
TLS Online TPP Program

#Question id: 11558

#Unit 7. System Physiology – Animal

Analysis of a blood sample from a fasting individual who had not eaten for 24 hours would be expected to reveal high levels of ________.
TLS Online TPP Program

#Question id: 3878

#Unit 3. Fundamental Processes

Which of the following statements about the synthesis of rRNA and tRNA in E. coli is true?
TLS Online TPP Program

#Question id: 10772

#Unit 8. Inheritance Biology

In an experiment plant RR round genotype have 100 seeds. In F1 generation 70 seeds are round and 30 seeds are wrinkled. So what will be
the penetrance value for round seeds?