In his monohybrid crosses, Mendel deduced that one trait was recessive because that trait was ____
a. not present in the F1 and did not reappear in the F2
b. present in the F1 and in the F2
c. not present in the F1 and reappeared in the F2
d. present only in the parents
e. present only in the F2
c
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Homeotic genes
A. encode transcription factors B. regulate developmental genes C. are unique to fruit flies D. encode transcription factors that regulate developmental genes E. are unique to fruit flies and encode transcription factors that regulate developmental genes
Old cultures of bacteria that have lost their ability to cause disease are said to be
A. pathogenic. B. impotent. C. attenuated. D. virulent.
Which of the following laboratory procedures is used for culturing animal viruses in the laboratory?
A) cell cultures B) broth cultures C) embryonated eggs D) both cell cultures and embryonated eggs E) synthetic cytoplasm
A chromosome without a centromere is ________
A) paracentric B) acentric C) dicentric D) pericentric E) segmental