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Afina-wow [57]
4 years ago
12

Which of the following statements describes the chromosome theory of inheritance as expressed in the early twentieth century? A)

No more than a single pair of chromosomes can be found in a healthy normal cell. B) Individuals inherit particular chromosomes attached to genes. C) Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis. D) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. E) Natural selection acts on certain chromosome arrays rather than on genes.
Biology
1 answer:
Iteru [2.4K]4 years ago
6 0

Answer:

  • <u>Option-</u> C.                        

Explanation:

  • The Mendelian genes are at specific loci on the chromosome and in turn segregate during meiosis which describes the chromosome theory of inheritance as expressed in the early twentieth century perfectly.
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2) Compare the types of neurons that synapse in the posterior, lateral, and anterior gray horns of the spinal cord.
Mama L [17]

Answer:

<h2>Gray matter: the gray matter is arranged intohorns: The posterior horn extends towards the dorsal root, the anterior horn extends towards the ventral horn, and the lateral horn lies between the posterior and anterior horns. </h2>

Explanation:

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Posterior horn:

Sensory neurons pass through the dorsal root ganglion after that the dorsal root and in the gray matter the neurons synapse to inter neurons in the posterior horn or may continue to the white matter and  then enter the spinal cord.

Anterior horn:

The motor portion of the nervous system has two parts; i) the somatic motor system and the ii) autonomic nervous system. The somatic motor neuron stimulates the skeletal muscle with stimulation. The somatic motor neuron cell bodies (part of verve cell) are in the anterior horn of the gray matter.

Lateral horn:  

The autonomic motor neuron send stimulation to smooth muscle, cardiac muscle, and glands etc. The cell bodies( part of nerve cell) of the autonomic motor neuron are in the lateral horn of the gray matter.

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