In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P)
is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with
white flowers produces 1/2 tall with purple flowers and 1/2 tall with white flowers. What is the
genotype of the parents? What will be an ideal response?
: DD Pp ? dd pp
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An epithelial tissue can best be defined as:
A. a collection of layered cells. B. a collection of contractile cells. C. a network of cells that use chemical communication. D. a few cells embedded into an extensive extracellular matrix.
Why is the productivity poor in the deeper parts of the ocean?
What will be an ideal response?
The pyramid of energy illustrates
a. the first law of thermodynamics. b. the diminishing of usable energy as it is transferred through an ecosystem. c. that energy can be recycled. d. the biological magnification of materials in an ecosystem. e. the diminishing number of organisms at each trophic level.
. Diploid stage(s) is (are) indicated by
a. A. b. B. c. C. d. D. e. B, C, and D.