Exchange of segments between nonsister chromatids of a bivalent during meiosis.
What will be an ideal response?
Crossing-over
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Explain why X-ray diffraction was important in the study of DNA structure and describe the procedure used in X-ray diffraction
What will be an ideal response?
Precancerous cervical cells can be detected by
a. routine Pap smears. b. self-examination. c. a series of blood tests. d. x-ray examinations. e. ultra-sound
Dissociation elements (Ds) in plants are examples of
A) activator transposons that can direct their own transposition. B) nonautonomous elements that require activation by an autonomous element. C) mutator genes that increase the spontaneous mutation frequencies of other genes. D) repeated sequences that are targeted by a transposase. E) Both B and C
Guard cells are often associated with __________, special epidermal cells that provide a reservoir of
water and ions. a. companion cells b. cuticle cells c. cork cells d. sclerenchyma cells e. subsidiary cells