a central vacuole is a cellular organelle found in plant cells
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The surface of the cerebral hemispheres consists of ridges and grooves. The shallow grooves are called Sulci.
<h3>What is Cerebral Hemisphere?</h3>
The brain is formed by two cerebral hemispheres. It is separated by a groove called longitudinal fissure. The brain is divided into left and right cerebral hemispheres. These consist of an outer layer of gray matter called the cerebral cortex which is supported by an inner layer of white matter.
In placental mammals, the hemispheres are connected by the corpus callosum which is a very large bundle of nerve fibers.
There are three poles of the cerebral hemispheres:
1. The occipital pole
2. The frontal pole
3. The temporal pole
The thin layers of cells that cover the cerebral hemispheres are called the cerebral cortex. These raised ridges of tissue on the surface of the cerebral cortex are known as gyri while the shallower grooves are called sulci.
Thus, the surface of the cerebral hemispheres consists of ridges and grooves. The shallow grooves are called Sulci.
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Mitosis
Involves one cell division?
Results in two daughter cells
Results in diploid? daughter cells? (chromosome? number remains the same as parent cell)
Daughter cells are genetically identical
Occurs in all organisms except viruses
Creates all body cells (somatic?) apart from the germ cells? (eggs and sperm)
Prophase is much shorter
No recombination/crossing over occurs in prophase.
In metaphase individual chromosomes (pairs of chromatids) line up along the equator.
During anaphase the sister chromatids are separated to opposite poles.
Meiosis
Involves two successive cell divisions
Results in four daughter cells
Results in haploid? daughter cells (chromosome number is halved from the parent cell)
Daughter cells are genetically different
Occurs only in animals, plants and fungi
Creates germ cells (eggs and sperm) only
Prophase I takes much longer
Involves recombination/crossing over of chromosomes in prophase I
In metaphase I pairs of chromosomes line up along the equator.
During anaphase I the sister chromatids move together to the same pole.
During anaphase II the sister chromatids are separated to opposite poles.
Similarities
Mitosis
Diploid parent cell
Consists of interphase, prophase, metaphase, anaphase and telophase
In metaphase individual chromosomes (pairs of chromatids) line up along the equator.
During anaphase the sister chromatids are separated to opposite poles.
Ends with cytokinesis.
Meiosis
Diploid parent cell
Consists of interphase, prophase, metaphase, anaphase and telophase (but twice!)
In metaphase II individual chromosomes (pairs of chromatids) line up along the equator.
During anaphase II the sister chromatids are separated to opposite poles.
Ends with cytokinesis.
