TLS Online TPP Program

#Question id: 2053


The single best chance of a tissue graft being accepted in a human recipient is if it is:

#Unit 4. Cell Communication and Cell Signaling
  1. An isograft

  2. An allograft given under the cover of potent immunosuppression

  3. A xenograft from a pig in which the gene for α-1,3-galactosyltransferase has been “knocked-out” and therefore the Galα-1,3-Gal epitope eliminated

  4. Given to a recipient that is treated with anti-CD3

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TLS Online TPP Program

#Question id: 3335

#Unit 9. Evolution & Diversity of Life Forms

Consider hypothetical populations that have arisen from the mixing of migrants from different sources: f(AA)- 0.30   f(Aa)- 0.0     f(aa)- 0.70 After one generation of random mating within population, what will be genotypic frequencies?

TLS Online TPP Program

#Question id: 3336

#Unit 9. Evolution & Diversity of Life Forms

There are 4 alleles at a given locus in a diploid population and all alleles are equal abundant. What is the proportion of all homozygotes in the population?

TLS Online TPP Program

#Question id: 3337

#Unit 9. Evolution & Diversity of Life Forms

Small populations are threatened by a least loss of genetic variability is due to

TLS Online TPP Program

#Question id: 3338

#Unit 9. Evolution & Diversity of Life Forms

If the expected frequency of heterozygotes in a population (based on the Hardy–Weinberg law) is 0.4, but the observed frequency is 0.2, what is the inbreeding coefficient?

TLS Online TPP Program

#Question id: 3339

#Unit 9. Evolution & Diversity of Life Forms

In a plant species, flower color locus either homozygous or heterozygous with genotype RR-red, Rr- pink and rr- white. The Proportional of pink flower in generation 0 is .50.  What is the level of remaining pink flower in a third generation of repeated selfing? 

TLS Online TPP Program

#Question id: 3340

#Unit 9. Evolution & Diversity of Life Forms

Which of the following statements is NOT correct regarding effect of genetic drift?