As an embryo develops, new cells are formed and different types of cells develop by the process of
A) differentiation and morphogenesis.
B) preformation and cell differentiation.
C) cell division and differentiation.
D) preformation and morphogenesis.
E) preformation and epigenesis.
Answer: C) cell division and differentiation.
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When analyzing octads (ordered tetrads), second-division (MII) segregations result from
A) single crossovers between linked genes. B) double crossovers between linked genes. C) single crossovers between a gene and a centromere. D) independent assortment of unlinked genes. E) nondisjunction of homologs.
What does the model of hybrid dysgenesis predict for the F1 and F2 generations when an M-cytotype male is crossed to a P-cytotype female?
What will be an ideal response?
________ are characterized by having a pseudocoelom
A) Chordates B) Roundworms C) Arthropods D) Annelids E) Cnidarians
____ are short sections of underground stem encased by overlapping layers of thickened, modified leaves called scales.
A. Stolons B. Rhizomes C. Bulbs D. Corms E. Tubers