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Allisa [31]
4 years ago
7

In Pavlov's study, the unconditioned stimulus (UCS) was ________; the neutral stimulus was ________; and, finally, the condition

ed stimulus (CS) was ________.
Biology
1 answer:
Oksana_A [137]4 years ago
5 0

Answer:

In Pavlov's study, the unconditioned stimulus (UCS) was __Meat_; the neutral stimulus was ___bell__; and, finally, the conditioned stimulus (CS) was __bell__.

Explanation:

Pavlov was a physiologist and was studying the digestive system but he came up with the most valuable studies of psychology. He put the tubes in dog mouth to collect saliva and calculate the amount of saliva produced by dog in response to different stimuli.

  • He provided the meat to dog and dog produced saliva in response to unconditioned stimulus of meat. It was the natural reflex.
  • He ring the bell but there was no saliva produced by dog in response to the bell. This was called as neutral stimulus.
  • Then he associated the ringing of bell just before providing the meat (unconditioned stimulus). After several time the dog started to produce saliva on ringing of bell which was conditioned stimulus (CS).

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Contrast the genetic content and the origin of sister versus nonsister chromatids during their earliest appearance in prophase I
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Complete question:

Question: Contrast the genetic content and the origin of sister versus nonsister chromatids during their earliest appearance in prophase I of meiosis.

a) Sister chromatids are genetically similar, except where mutations may have occurred during DNA replication. Nonsister chromatids are genetically dissimilar.  

b. Sister chromatids are genetically identical, except where mutations may have occurred during DNA replication. Nonsister chromatids are genetically similar if on homologous chromosomes and genetically dissimilar if on nonhomologous chromosomes.  

c. Sister chromatids are genetically identical, except where mutations may have occurred during DNA replication. Nonsister chromatids are genetically similar.

d. Sister chromatids are not genetically similar, except where mutations may have occured during DNA replication. Nonsister chromatids are genetically similar if on homologous chromosomes and genetically dissimilar if on nonhomologous chromosomes.

Answer:

b. Sister chromatids are genetically identical, except where mutations may have occurred during DNA replication. Nonsister chromatids are genetically similar if on homologous chromosomes and genetically dissimilar if on nonhomologous chromosomes.  

Explanation:

A chromosome has two chromatids after the S phase of the cell cycle. The replicated DNA molecules are accommodated in the sister chromatids. Therefore, two chromatids of a chromosome carry the identical DNA molecule and are genetically identical to each other. The sister chromatids may carry different genes if one or more mutation occurs in their DNA.  

Two chromatids of two different chromosomes are called non-sister chromatids. Homologous chromosomes are the chromosomes that are similar in morphology and genetic constitution. Therefore, two chromatids of a homologous pair are also non-sister chromatids but have genetically identical sequences. For example, the two non-sister chromatids of the pair of chromosome 21 in humans carry the alleles for the same genes.

However, the non-sister chromatids that belong to nonhomologous chromosomes carry different genes and are not genetically identical.

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