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Marrrta [24]
3 years ago
8

Andrew was exposed to the chicken pox virus as a child. What happened to that virus after it crossed the blood-brain barrier and

entered Andrew’s brain? a. Nothing happened at first, but the virus remained there and caused negative effects for Andrew as he got older. b. Nothing happened since the chicken pox virus cannot cross the blood-brain barrier. c. The glia in his brain engulfed the virus and then natural killer cells destroyed them both. d. Andrew’s natural killer cells were able to quickly destroy it.
Biology
1 answer:
siniylev [52]3 years ago
5 0

Answer: Option A

Explanation:

When Andrew was exposed to the virus causing chicken pox he got infected and the virus crossed the blood brain barrier.

During the early stages when Andrew was a child there will be as such no effect of the virus in the brain.

During the early stage the virus will remain in the brain and cause harm in the later days when Andrew will be older.The virus can alter the brain functions such as homeostasis, blood brain barrier functions.It enters the brain while damaging the nervous system.

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Meiosis is a form of the mobile department in sexually reproducing organisms that reduces the number of chromosomes in gametes (the intercourse cells, or egg and sperm).

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Seeing that cellular division takes place twice at some point of meiosis, one beginning cellular can produce <u>4 gametes</u> (eggs or sperm). In every spherical division, cells go through 4 ranges: prophase, metaphase, anaphase, and telophase.

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There are three phenotypes, so it seems that this an example of incomplete dominance, with the short tail being the intermediate form between long-tail and no-tail. Incomplete dominance is a condition where neither of the alleles completely dominates over the other one. Dominant alleles cannot completely cover up the recessive alleles. Descendents possess an intermediate phenotype between the two parental phenotypes and not the dominant one, which would appear if this would be the case of complete dominance.

<u>Available data:</u>

  • Two short-tailed Manx cats are bred together.
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The T gene might express the tail trait. T allele expresses long the tail and is dominant over t allele which expresses the absence of the tail.  

So, homozygous dominant individuals, TT, are long-tailed animals

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Punnet Square)  T        t

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     1/4 tt = untailed animals

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