In a cross between two blue Andalusian chickens, 25% of the offspring produced were white, 25% where black, and 50% were blue Andalusian like the parents. Color in these chickens is most likely inherited by
A. multiple alleles.
B. polygenic.
C. pleiotropy.
D. incomplete dominance.
D. incomplete dominance.
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A mutation in E. coli results in the loss of both restriction endonucleases and modification enzymes. Would you expect any difference in the frequency of gene transfer via transduction FROM Salmonella INTO this E. coli strain?
A. No-since the Salmonella strain is normal, the rate of production of transducing virus particles would still be the same, resulting in the same frequency of gene transfer. B. Yes-the loss of the restriction endonucleases would leave the recipient E. coli unable to break down "invading"' viral DNA from the transducing phage. This would lead to higher rates of successful transduction. C. Yes-the loss of the modification enzymes would leave the recipient E. coli unable to tag its own DNA as "self," leaving the viral DNA untagged and recognizable as "foreign," and targeted for destruction. This would lead to higher rates of successful transduction. D. No-transduction efficiency isn't affected by either restriction endonucleases or modification enzymes, so there'd be no effect on the overall rate. E. Yes-the loss of the restriction endonucleases would leave the recipient E. coli unable to break down "invading" viral DNA from the transducing phage, AND the loss of the modification enzymes would leave the recipient E. coli unable to tag its own DNA as "self," leaving the viral DNA untagged and recognizable as "foreign," and targeted for destruction. Together, thesewould lead to higher rates of successful transduction.
Which of the following are most permeable to
water and small molecules? a. glomerular capillaries b. peritubular capillaries c. afferent arterioles d. ureters e. efferent arterioles
Forms of inheritance that do not follow typical Mendelian patterns and that appear to be more influenced by the parent contributing the most cytoplasm to the embryo are grouped under the general heading of ________
A) neo-Mendelian inheritance B) suppressive inheritance C) sex-linked inheritance D) dominance and/or recessiveness E) extrachromosomal inheritance
Meiosis I produces _____ cells, each of which is _____.
Fill in the blank(s) with the appropriate word(s).