A horse has a diploid number (2n) of 64 and a donkey has 2n = 62. The hybrid of these two species, mules, have 2n = 63 and are sterile. Why are mules sterile?
A) Mules cannot physically mate with each other.
B) Horses are not able to form new species.
C) Mules are not true hybrids.
D) One chromosome is unpaired and fails to divide properly during meiosis.
E) Mules cannot physically mate with horses and donkeys.
D
You might also like to view...
How is breathing rate regulated in humans before and during physical exercise?
What will be an ideal response?
A newly evolved species may take over an ecological role or ecological niche that is already occupied
if the new species has:a. the ability to alter or change the environmental parameters. b. features that make it competitively superior to the original occupant of that niche. c. the ability to evolve through natural selection, whereas the original occupant cannot continue to evolve. d. the ability to grow to a larger size, thus providing it with a selective advantage. e. fitness that is almost as high as the fitness of the original species.
When does a cell regulate gene expression?
A. Pretranscription through pretranslation B. Pretranscription through posttranslation C. Posttranscription through posttranslation D. Posttranscription through pretranslation
Parenchyma, collenchyma, and sclerenchyma are all types of cells derived from
A. procambium tissue. B. epidermal tissue. C. ground tissue. D. cork cambium tissue. E. vascular cambium tissue.