Which of the following reasons was essential for Mendel's law of independent assortment?
(a) All the traits that Mendel examined involved genes that did not display linkage.
(b) Several of the phenotypes that Mendel examined involved color.
(c) Mendel observed chromosomal segregation in pea-plant cells.
(d) Mendel carried out his experiments on plants and not on fungi.
(a) To see the 9:3:3:1 segregation from a dihybrid cross, the two traits cannot be linked. Although choice (b) is true, it was not necessary for Mendel to determine the law of independent assortment. Mendel did not observe chromosomal segregation [choice (c)]. The law of independent assortment holds true in animal, fungal, and plant cells.
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Which statement concerning root hairs is not correct?
A. Root hairs are tubular extensions of individual epidermal cells. B. A root hair is isolated from its epidermal cell with a cross wall. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs increase the absorption of water and minerals. E. Root hairs are located in the zone of maturation of a root.
Which of the following represents an effective method for controlling yeast populations in a test sample?
a. constant stirring to break up biofilms b. percolating oxygen through the sample c. adding antibiotics to the test sample d. adding enzymes to inhibit mating factor
Garlic contains an antimicrobial substance called (allicin/penicillin/streptomycin)
What will be an ideal response?
Three loci, mitochondrial malate dehydrogenase that forms a and b (MDHa, MDHb), glucuronidase that forms 1 and 2 (GUS1, GUS2), and a histone gene that forms + and ? (H+, H?), are located on chromosome #7 in humans. Assume that the MDH locus is at
position 35, GUS at position 45, and H at position 75. A female whose mother was homozygous for MDHa, GUS2, and H+ and whose father was homozygous for MDHb, GUS1, and H? produces a sample of 1000 egg cells. Give the expected numbers of the MDHa GUS2 H? cells she would produce. Assume no chromosomal interference. A) 15 B) 135 C) 315 D) 0 E) 235