Parents can pass on chromosomes to their children that are different than their own when the new gene combinations are created b
y A) crossing over of sister chromatids during meiosis. B) crossing over of sister chromatids during mitosis. C) crossing over of homologous chromosomes during mitosis. D) crossing over of homologous chromosomes during meiosis.
2 answers:
Answer:
The most appropriate answer would be D) crossing over of homologous chromosomes during meiosis.
Crossing over is the event that takes place during the pachytene stage of prophase 1 of meiosis 1.
During this event, genetic material is exchanged between the non-sister chromatids of the homologous chromosomes.
The homologous chromosomes assemble near each other in a synapsis. The tetrad or bivalent is formed during this period.
The point of contact where the actual exchange of genetic material takes place is termed as chiasma.
Crossing over results in new combination of genes different from either parent.
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The correct answer is "transmission electron microscope".
The transmission electron microscope can magnify the organelles of the cell clearly; as in light microscopes wherein most organelles cannot be visualized. TEM works by using a beam of electrons to pass through a specimen to make a clear image. Because of its superior magnification, mitochondrial defects can be visualized easily.
Attached is a sample picture of a transmission electron microscope image of a mitochondria.
The transmission electron microscope can magnify the organelles of the cell clearly; as in light microscopes wherein most organelles cannot be visualized. TEM works by using a beam of electrons to pass through a specimen to make a clear image. Because of its superior magnification, mitochondrial defects can be visualized easily.
Attached is a sample picture of a transmission electron microscope image of a mitochondria.