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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology