Which of the following reflects genetic differences?
a. phenotypic variation among organisms
b. genotypic variation among organisms
c. genotypic and phenotypic variation among organisms
d. genotypic and phenotypic variation among populations
Answer: a. phenotypic variation among organisms
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The type of plant hormone primarily responsible for inhibiting leaf abscission is/are ____
a. gibberellins b. ethylene c. jasmonates d. abscisic acid e. auxins
The direct role of LH in males is to
a. stimulate testosterone secretion. b. stimulate spermatogenesis. c. stimulate Sertoli cells. d. inhibit GnRH secretion. e. do all of these.
Why is it important that the cells of the phloem remain alive
What will be an ideal response?
The expression of both alleles for a trait in a heterozygous individual illustrates
A) codominance. B) pleiotropy. C) polygenic inheritance.