Describe the benefits of self-incompatibility and self-compatibility
What will be an ideal response?
ANSWER: A benefit of self-incompatibility is that it prevents inbreeding. Inbreeding can result in
deleterious mutations. Self-incompatibility promotes genetic variation by increasing the
probability of outcrossing. Self-compatibility can benefit a plant population by preserving
adaptive traits. In addition, a self-compatible plant does not have to rely on wind or
animals for pollination, and therefore can ensure that seeds can form.
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In a mollusk, which of the following acts like a kidney by carrying out excretion?
a. metanephridia b. chaetae c. ctenidia d. radula
The upper layer of warm, low-density water of an open body of water is called the ________
Fill in the blank(s) with correct word
Change in the DNA-histone complex that can increase or decrease transcriptional activity is termed
A) induction. B) gene regulation. C) chromatin remodeling. D) nucleosome formation. E) None of these
Which statement concerning root hairs is not correct?
A. A root hair is isolated from its epidermal cell with a cross wall. B. Root hairs increase the absorption of water and minerals. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs are located in the zone of maturation of a root. E. Root hairs are tubular extensions of individual epidermal cells.