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soldier1979 [14.2K]
2 years ago
10

Describe how a zygote with trisomy 21 is likely to occur during fertilization.

Biology
1 answer:
maks197457 [2]2 years ago
5 0

Answer:

If the paired chromosomes fail to separate during meiosis in the female, then the resulting daughter cells will receive either 2 or no copies of chromosome 21. If the resulting egg with 2 copies of chromosome 21 is fertilized with a normal sperm, the resulting zygote with be trisomy 21

Explanation:

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Nicholas is a college student who must present a summary of a recent chemical discovery to his class. What pair of sources would
alina1380 [7]

Answer:

Option D,  a research paper published in an academic journal and an approved PhD dissertation

Explanation:

Nicholas must present her discovery with back up of strong literature review. This literature review must include papers published in good journals and only approved research dissertation.  

An internet blog, news article and college level textbook are not considered as an approved study. These are not reviewed or approved by any peer group or associations.  

Good papers of any good journals are reviewed and examined thoroughly by the peers and thus they can be used as a backup of any study.  

Hence, option D is correct

7 0
3 years ago
I REALLY NEED HELP. I DO NOT GET THIS AT ALL. PLEASE HELP ME. IT WILL BE GREATLY APPRECIATED.
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Answer:

The test cross is shown below

      T         T

t      Tt         Tt

t       Tt         Tt

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For the variety of offsprings to be 100% tall, the recessive parent had to be crossed with a homozygous dominant parent.  If the female was heterozygous with which the cross was done,then there would be small tomato plants in the offspring generation.

3 0
3 years ago
A technique that uses measurement of radioactive isotopes to evaluate the activity of the brain is
Furkat [3]
<span>The answer is nuclear imaging. A subject is asked to take in a radionuclide (radioactive isotopes) and as the radioactive material passes though the body, it continually emits radiation that is detectable by an instrument such as a gamma camera. Examples of nuclear imaging techniques are SPECT and PET.</span>




7 0
3 years ago
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I need help. The class of macromolecule that would most likely be involved in contracting muscles would be ?
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Answer:

B

Explanation:

3 0
1 year ago
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Cecil is sexually attracted to his middle-school English teacher. He doesn’t act on his feelings however, because he realizes th
Alex777 [14]

Answer:

Ego

Explanation:

In 1923, Sigmund Freud's personality theory was structured into three different parts viz: Id, ego and superego

The id is the instinctive and unconscious part of the personality which responds directly to urges, needs and desires. The id operates on the pleasure principle that every wishful impulse should be satiated instantly regardless of the resulting effect.

The ego is the part that mediates between the unreasonable id and societal beliefs. It is the reasoning and decision-making component of the psyche.

The superego is the part that acts as a self critical conscience, reflecting the social standards that has been learnt

In this scenario involving Cecil, the id part of his personality is responsible for the sexual attraction to his English teacher but the ego part of his personality is making him realize that is socially unreasonable for his teacher to respond to his sexual advances. His ego, which operates with the reality principle is restraining him from acting from his feelings in consideration of social realities.

Therefore, his ego is restraining him from expressing his feelings of sexual attraction (Id) considering societal consequences.

4 0
3 years ago
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