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1 year ago

What experiment did bell perform to show that the nerves of the body contain a mixture of sensory and motor fibers?

Biology

1 answer:

irinina [24]1 year ago

6 0

Bell performed experiments to show that nerves of the body contain a mixture of sensory and motor fibers.

In his experiment he tested if the two spinal roots that originally originated from spinal nerve carry signals in opposite direction to each other just prior to their joining at the spinal cord. The dorsal roots generally joined the spinal cord from the back while the ventral roots joined the spinal cord from the front.

He experimented on animals by cutting the ventral roots and noticed muscular paralysis, later with more observation came to the conclusion that the ventral roots carry signals back to the muscles and are motor in nature. While the dorsal roots are sensory in nature thus the nerves in the body are a mixture of sensory and motor nerves.

To know more about sensory and motor fibers refer to the link below

brainly.com/question/8945775

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The pedigree below tracks the presence of dimples through a family's generation. Having dimples is an autosomal dominant trait.

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A pedigree is a representation of a family history tracking a trait. The graph shows the inheritance pattern of the trait and its expression through several generations.

<h3>What is an autosomal dominant trait?</h3>

The autosomal dominant trait is the characteristic that is coded by a gene located in an autosomal chromosome (this is, not a sexual chromosome).

This trait is dominant because it is coded by the dominant allele, meaning that the recessive allele codes for the absence of dimples. The presence of only one dominant allele in the genotype is enough for the idividual to express dimples.

<u> Genotype Phenotype </u>

DD, Homozygous dominant Dimples

Dd, Heterozygous Dimples

dd, Homozygous recessive No Dimples

<h3>What is a pedigree?</h3>

The pedigree is the representation of a family history conserning a certain trait. In this case, dimples.

The pedigree shows the expression -and inheritance pattern- of the trait through several generations.

To correctly interpret a pedigree, we need to know that

Family members

→ Individuals are represented with geometrical figures.

→ Males are squares

→ Females are circles

Trait/Phenotype

→ Healthy/normal/not affected individuals are represented with empty figures

→ Affected/mutated individuals are represented with solid black figures

Generations

→ Each file is represented with a roman number, indicating the Generation.

Here we will assume that

Individuals represented with solid figures express dimples -shaded individuals-. They can be either DD or Dd. This is because dimples is not usuall.

Individuals with no dimples are represented with empty figures and are dd.

According to the provided pedigree,

I-1 ⇒ man DD or Dd

I-2 ⇒ woman dd

II-1 ⇒ man Dd or DD

II-2 ⇒ woman dd

II - 5 ⇒ woman dd

III - 1 ⇒ man Dd

III- 2 ⇒ woman dd

III - 6 ⇒ woman dd

Since this pedigree does not specify the relationship between individuals, I can not answer the question based on it. So, I will attach another tree to specify genotypes.

I advise you study this new example, and then follow the same reasoning to choose the correct individual according to you pedigree.

Yo can learn more about pedigrees at

brainly.com/question/19516649

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