Answer the following statements true (T) or false (F)

1. The fast block to polyspermy occurs through a rapid increase in cytosolic calcium within the egg.
2. The sperm and its DNA enters the egg through simple diffusion through the egg plasma membrane.
3. The cortical reaction prevents multiple sperm from contributing their chromosomes to the egg.
4. Most of the egg yolk found in certain vertebrates is restricted to the animal pole?


1. FALSE
2. FALSE
3. TRUE
4. FALSE

Biology & Microbiology

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Why is speciation by polyploidy more likely in plants than in animals?

A) Plant gametes can be produced by meiosis from somatic cells that have undergone many rounds of mitosis. B) Plant gametes lack postzygotic isolating mechanisms. C) Plants are sessile and, therefore, are never prezygotically isolated to ensure reproduction. D) Plants are sessile and cannot speciate via dispersal. E) Plants lack the DNA repair enzymes that animals have.

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The initial carrying capacity of an environment

is indicated by a. A. b. B. c. C. d. D. e. E.

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A novel, derived character is also referred to as a(n) ________

A) apomorphy B) plesiomorphy C) synapomorphy D) clade

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Explain the dideoxy sequencing method

What will be an ideal response?

Biology & Microbiology