Which of the following linkage maps correctly shows the order and distance between the y, f, and v genes?
In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows:
A) f——35 m.u.——y——15 m.u.——v
B) f——22 m.u.——y——15 m.u.——v
C) y——35 m.u.——f——22 m.u.——v
D) y——22 m.u.——v——15 m.u.——f
E) y——15 m.u.——v——22 m.u.——f
E) y——15 m.u.——v——22 m.u.——f
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The antimicrobials produced by some molds and bacteria are generally called
A. insecticides. B. biocides. C. antiseptics. D. antibiotics
Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb
The fully homozygous recessive condition (rrpp) produces the single comb. Assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut, 16 rose, 7 pea, 6 single. (a) What are the probable genotypes of the parents? (b) Give the genotypes of each of the offspring classes.
Artifcatual precipitate seen in the Grocott stain may be the result of using:
a) plastic forceps b) gelatin in the water bath c) glassware that was not chemically clean d) excess time in the gold chloride solution
If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green. B. The maternal plant must be green and the paternal plant must be white. C. The maternal plant must be variegated and the paternal plant can be any color. D. Both the maternal and paternal plant must be variegated. E. The maternal plant must be variegated and the paternal plant must be white.