All members of the golden hamster species known today are descendants of a single litter collected in Syria in 1939. Its diploid chromosome number is 44. Two other species of hamster, each with a diploid number of 22, overlap geographically in Syria
The golden hamster is thought to be a new species from the mating of a male and female of the two other hamster species. What mechanism might explain this recent event of speciation?
A) Polyploidy
B) Adaptive radiation
C) Formation of a fertile hybrid and halving of the chromosome number of this hybrid
D) Disruptive selection
E) Temporal isolation
A
You might also like to view...
Snapping division is a hallmark trait of ________ which can be visualized under a microscope by ________
A) Actinobacteria / two adjacent cells linked, appearing as an M dividing into four B) Actinobacteria / one cell appearing as a V dividing into two C) Coryneform bacteria / two adjacent cells linked, appearing as an M dividing into four D) Coryneform bacteria / one cell appearing as a V dividing into two
Fertilization of an ovum normally occurs in the
A. uterus. B. ovary. C. oviduct. D. vagina. E. cervix.
The central dogma refers to
A. passage of genetic information from RNA to specific proteins by transcription. B. inheritance of DNA genetically controlled traits from parents to offspring in every organism. C. passage of genetic information from DNA to RNA by translation. D. the similarity of the energy molecule ATP to the nucleotides in DNA. E. the flow of genetic information in cells, from DNA genes to specific proteins.
Which of the following statements is true?
A) A band of ribosomes determines where a cell plate will form in a dividing plant cell. B) The way in which a plant cell differentiates is determined by the position of the nucleus in the developing plant cell. C) Homeotic genes often control morphogenesis. D) Plant cells differentiate because the cytoskeleton determines which genes will be turned "on" and "off."