Compare and contrast the processes of oogenesis and spermatogenesis
What will be an ideal response?
In spermatogenesis, four viable haploid gametes are produced, each with only one set of chromosomes. In oogenesis, one viable egg with 23 chromosomes and three polar bodies that play no part in fertilization or sexual reproduction is produced. Also, spermatogenesis continues to completion in the testes. However, oogenesis does not continue to completion in the ovaries; it is completed only if the egg is fertilized. Spermatogenesis is an almost continuous process; oogenesis occurs approximately once a month. Spermatogenesis continues throughout the life of the male; oogenesis ceases at menopause.
You might also like to view...
Which of the following criteria have to be met for a species to qualify as invasive?
A) endemic to the area, spreads rapidly, and displaces foreign species B) introduced to a new area, spreads rapidly, and displaces native species C) introduced to a new area, spreads rapidly, and displaces other invasive species D) endemic to the area, spreads slowly, and displaces native species
The principal role for sugars in living organisms is to
A. create cellular energy. B. produce hormones. C. serve as a form of long-term energy storage. D. form cell membranes. E. create our genetic code.
Refer to the accompanying figure. Which of these lungs would be found in reptiles?
a. 1 only b. 2 only c. 3 only d. 4 only e. both 1 and 2
Which of the following is a major influence on the direction of evolution (which organisms go extinct and which new ones evolve)?
A. the environmental conditions a species encounters B. the size of the Earth C. mutations in the cells that do not form gametes D. floods, tornados, earthquakes, and hurricanes