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TLS Online TPP Program

#Question id: 12755

Which of the following statements best describes why biologists are currently concerned with global warming and the thawing of permafrost in many areas of the tundra biome?

#Unit 10. Ecological Principles
  1. The thawing process will likely decrease the abundance and diversity of soil-dwelling organisms in tundra habitats.
  2. The bacterial decomposition of  the thawed organic materials on  the widespread areas of  the tundra will produce large quantities of CO2, which will add to greenhouse gases and exacerbate global warming.
  3. Oil and coal deposits will thaw and rise to the surface (because of their lower density) of the tundra, destroying millions of acres of arctic habitat.
  4. Populations of humans inhabiting the arctic will have to move to more southern latitudes, resulting in in- creased competition for resources in already densely populated areas.
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TLS Online TPP Program

#Question id: 5719

#Unit 8. Inheritance Biology

Homologous chromosomes pair in prophase I as a following way, if crossingover occur between P and Q gene of homologous chromosome?

Which of the following proceeding event due to this abnormality?

A. Dicentric chromosome become breaks at anaphase I

B. Resulting one of the gamete received chromosome with deleted segment 

C. Recombinant gamete unable to produced viable progeny

D. Unable to separation of chromosome in anaphase II
TLS Online TPP Program

#Question id: 5718

#Unit 8. Inheritance Biology

aneuploids may arise through nondisjunction, the failure of homologous chromosomes or sister chromatids to separate in meiosis. which of following the incorrect about nondisjuction ?
TLS Online TPP Program

#Question id: 5717

#Unit 8. Inheritance Biology

Following homologous chromosome is a heterozygous for inversion

Following some statement regarding above abnormality is correct?

A. During meiosis, one chromosome twists once at the ends of the inversion to pair with the other untwisted chromosome

B. Crossing-over within the inversion loop at meiosis connects homologous centromeres in a dicentric bridge.

C. Tension eventually breaks the dicentric bridge, forming two chromosomes with terminal deletions.

D. the RF is zero among genes within the inversion region
TLS Online TPP Program

#Question id: 5716

#Unit 8. Inheritance Biology

Which of the meiotic pairing possibilities in tetraploids and their consequence is correct?

A-chromosomes pair as bivalents, segregate normally producing diploid gametes.

B- Chromosomes pair as quadrivalent, segregates normally producing tetraploid gametes.

C-Chromosome pair as Trivalents form, segregation leads to nonfunctional aneuploid gametes

 D- Chromosome pair as Trivalents form, segregation leads to producing diploid gametes
TLS Online TPP Program

#Question id: 5715

#Unit 8. Inheritance Biology

Following some abnormality is due to Gene rearrangement on chromosome. 

A, Affecting the expression of gene

B. Disrupt the function of gene

C. Reduced recombination between gene present in inverted region

D. Cross over suppressor 

Which of the following above abnormality is may be associated with inversion?
TLS Online TPP Program

#Question id: 5714

#Unit 8. Inheritance Biology

Homologous chromosomes pair in prophase I as a following way, if crossing over occur between P and Q gene of homologous chromosome?

Which of the following consequence of above abnormality?

A. Dicentric chromosome visible at anaphase I

B. Results in formation of acentric chromatid

C. Recombinant gamete unable to produced viable progeny due to missing of many gene

D. Resulting recombinant gamete become aneuploid