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TLS Online TPP Program

#Question id: 9202

Which of the following statements regarding extinction is accurate?

#Unit 9. Diversity of Life Forms

  1. A large percentage of species are immune from extinction; however, rates of extinction may increase with continued human impacts.

  2. Extinctions occur only periodically, separated by long time spans with no extinctions.
  3. Extinction is occurring at a similar rate now as compared to historical fossil evidence.

  4. The small-population approach is inferior to the declining-population approach if the goal is to conserve the maximum number of species in a given region.

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TLS Online TPP Program

#Question id: 12474

#Unit 10. Ecological Principles

The most common kind of dispersion in nature is
TLS Online TPP Program

#Question id: 5838

#Unit 8. Inheritance Biology

In the Holliday model describing recombination
TLS Online TPP Program

#Question id: 3553

#Unit 8. Inheritance Biology

Diploid cell genotype AaBb undergoes meiosis that generates new combinations of alleles by which mechanism when gene A and B located on the same chromosome?  
TLS Online TPP Program

#Question id: 17675

#Unit 8. Inheritance Biology

In humans, albinism (unpigmented skin, hair, and eyes) is due to an enzymatic deficiency, and it is an autosomal recessive trait. Suppose that in a small country of one million people (“Generation 1”), there are 500 aa albinos and 9000 Aa heterozygous carries. If the Generation 1 follow the Hardy-Weinberg equilibrium?
a) then the number of homozygous aa albino individuals would be equal to P2
b) there were 500 albino individuals in generation one.
c) then the number of homozygous aa albino individuals would be equal to q2
d) there were 25 albino individuals in generation one.
Which of the following is the correct prediction about the hardy-weingburg equilibrium?
TLS Online TPP Program

#Question id: 26787

#Unit 8. Inheritance Biology

In the S phase of meiotic interphase, each chromosome replicates, producing two copies of each allele, one on each chromatid, the homologous chromosomes segregation takes place in__

Which of the following statements is correct about the segregation of chromosomes?

a.If no crossing over has taken place, the two chromatids of each chromosome segregate in anaphase II and are identical

b. If crossing over has taken place, the two chromatids are no longer identical, and the different alleles segregate in anaphase II

c. If no crossing over has taken place, the two chromatids of each chromosome segregate in anaphase I and are identical