Answer:
D) homologous pairs of chromosomes form tetrads
Explanation:
During prophase I, the homologous chromosomes condense and become visible as the x shape we know, pair up to form a tetrad, and exchange genetic material by crossing over.
Brain controls nerves
Heart pumps the blood
any crop grown to be sold on the commodities market.
Answer:
Chromosomes are made up of DNA(deoxyribosenucleicacid) which is a protein complex called chromatin that is organized into subunits called nucleosomes. The way in which eukaryotes compact and arrange their chromatin also helps regulate gene expression.
Explanation:
Answer:
<u>From the main motor cortex, Brodmann region 4 premotor areas and the primary somatosensory cortex .</u>
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Explanation:
The corticospinal tract originates in many regions of the brain, including
- the motor regions,
- main somatosensory cortex
- pre-motor regions
The corticospinal tract allows for voluntary control of motor functions.
30% of the neurons in the corticospinal regions are found in the primary motor cortex. 40% are split up in several regions; the parietal lobe, somatosensory cortex and the cingulate gyrus.
The axon is a tube enclosed in and insulated by the myelin sheath. It serves as a link to impulses for certain neurons that often comprise axon hillocks that are junctions between the axon and the cell body.