At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur?
What will be an ideal response?
at the four-strand stage of meiosis, after synapsis of homologous chromosomes, and before the end of prophase I
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Which of the following mechanisms of genetic transfer was first observed by Lederberg and Tatum (1946) in Escherichia coli?
A. Transformation B. Transduction C. Conjugation D. All of the answers are correct
Which of the following describe a role that ethylene plays in plant physiology. Check all that apply.
_____ Retarding stem and root elongation. _____ Hastening the ripening of fruit. _____ Inhibition of leaf abscission. _____ Inhibition of lateral bud growth. _____ Accelerates the loss of damaged fruits.
Four of the five choices listed below are terms used
in describing fungi. Select the exception. a. hyphae b. peptidoglycan c. dikaryotic stage d. spore e. mycelium
Which statement is true for a population with an age structure diagram in the shape of a pyramid?
a. It is a rapidly growing population. b. It means the population is mostly older individuals. c. It would be associated with a developed country. d. It would be indicative of the United States. e. It means the death and birth rates are equal.