1) During which phase of the cell cycle is DNA replicated? A. GI B. G2 C. S D. C
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Question
1) During which phase of the cell cycle is DNA replicated? A. GI B. G2 C. S D. Cytokinesis 2) If you were told that for a certain plant, its height was controlled by one gene that exhibited incomplete dominance, what pattern would you expect in the plants" height? A. Three distinct height phenotypes-tall, medium, and short B. All plants the same height C. No discrete height phenotypes--a continuous range with most plants of middle height D. Two height phenotypes-tall and short 3) During this stage of mitosis, the nuclear envelope fragments, and the chromosomes condense and become visible A. Anaphase B. Telophase C. Metaphase D. Prophase 4) When breeding fruit flies, a geneticist notices that two traits (almost) always pair: long wings with grey bodies, and short wings with black bodies. What genetic phenomenon is this researcher observing? A. Sex-linked genes B. Linked genes C. Independent assortment D. Polygenic inheritance 5) If a chromosome experiences a break, and the fragment is re-attached in the reverse direct occurs: tion to the original chromosome, this type of chromosomal rearrangement A. Deletion B. Translocation C. Inversion D. Duplication 6) In prophase I of meiosis I, this key event occurs, producing genetic recombination: A. DNA replication B. Independent assortment C. Interkinesis D. Crossing overExplanation / Answer
Answer 1) C
DNA Replication happens during S phase also known as synthesis phase. It occurs after G1 phase during which ATP and protiens (Enzymes required for DNA duplication ) are produced
Answer 2) C
All plants will be of medium height due to incomplete dominance of the gene for the trait height.
Answer 3 ) D
During prophase chromosomes appear as thin threads and start to condense. During late prophase disintegration of nucleolous within nucleoplasm takes place.
Answer 4) B
linked genes are located on the same chromosome and are inherited together.
Answer 5) C
Inversion : all the genes will be present but the order will be inverted on attachment.
Answer 6) D
most impoartant event in prophase 1 during meiosis is crossing over of non sister chromatids at the chiasmata, this leads to variation due to exchage of genetic material .
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