What is the main difference between the haploid and diploid phases of animal and plant life cycles?
What will be an ideal response?
In animals, the diploid phase is the predominant one, and the haploid phase is reduced. In plants, there
is an alternation between haploid and diploid multicellular phases.
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Which of the following describes the Skene's gland?
A. It is located on the clitoral hood. B. It has no known function. C. Its ducts empty into the urethra. D. It secretes fluid for all women.
Thalassemia is a recessive blood disease caused by reduced synthesis of one of the globin genes
While SCD is a mutation in the structure of hemoglobin, thalassemias can also be caused by mutations in the regulatory elements, causing too little globin to be produced and resulting in anemia. You've designed a DNA probe that you want to use to screen a family for a rare mutation in the ?-globin gene that causes thalassemia. First you will use the probe for northern blotting. What information will the northern blot tell you? A) whether the mRNA for ?-globin is being translated into functional proteins in a given cell population B) whether the amount of the ?-globin gene being transcribed (mRNA levels) is within normal range C) the size of the mRNA being transcribed D) the presence of a particular mutation by restriction fragment analysis E) both B and C are correct
A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare. Which of the following terms best describes this?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
The sexual life cycle of plants is described as alternation of generations because it alternates between
A) reproductive plants and vegetative plants. B) eggs and sperm. C) flowers and spores. D) male plants and female plants. E) sporophytes and gametophytes.