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2 years ago

Please tell me as much as you can about non-disjunction and the consequences of non-disjunction at meiosis 1 versus meiosis 2

Biology

1 answer:

QveST [7]2 years ago

7 0

Answer/Explanation:

Nondisjunction is when homologous chromosomes or sister chromatids fail to properly separate during meiosis. This means daughter cells have an incorrect set of chromosomes.

Nondisjunction occurs during meiosis I or II, with different results in each. The outcomes at either meiosis i or meiosis ii are shown in the attached picture (nondisjunction at meiosis ii on the left (blue arrow) and nondisjunction at meiosis i on the right (dark green arrow)

Nondisjunction during meiosis i

Nondisjunction during meiosis i occurs when homologous chromosomes fail to properly separate. This results in two gametes without that chromosome, and two gametes with two copies of that chromosome. This is wrong, as each gamete should have one copy.

Nondisjunction during meiosis ii

If the sister chromatids fail to separate during meiosis II (the homologous chromosomes have already successfully separated), then there will be two normal gametes that have one copy of the chromosome (correct), one gamete will not have that chromosome, and one gamete with two copies of the chromosome.

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Xelga [282]

I will mark brainlist please help

Story : A Dog’s Tale by Mark Twain

4. Read this sentence from the selection.

“Whenever she heard a large word she said it over to herself many times, and so was able to keep it until there was a dogmatic gathering in the neighborhood.”

In this sentence the word dogmatic is used as —

• an insightful simile
• a descriptive metaphor
• a humorous play on words
• an illuminating allusion

5. In the last paragraph the narrator says his mother would “fetch out a long word.” The connotations of the word fetch remind the reader that the narrator’s mother —

• is well educated
• is a dog
• knows lots of big words
• likes to show off

8. What is ironic about the author’s mother showing off with her knowledge of the word unintellectual?

• Her child knew she didn’t understand the word correctly.

• The strangers all already knew the meaning of the word.

• As any intellectual would know, the word should be “nonintellectual.”

• She did not know any synonyms for the word.

9. Which type of person is most like the author’s mother?

• A high-performing student with an excellent memory for words

• A very verbal person who always has a quick answer that sounds good

• A dishonest person who tells lies on a regular basis

• A person who likes dogs a lot and works at a veterinary clinic

8 0

2 years ago

Explain which direction the molecules will move during diffusion?

allochka39001 [22]

Answer:

Up and down

Explanation:

In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space.

4 0

3 years ago

Read 2 more answers

15 points. Need it asap

Tema [17]

Answer:

i think its A but i'm not sure.

7 0

3 years ago

Read 2 more answers

Label the brain parts<br><br> Please help me with this assignment

Anastaziya [24]

Answer:

A = parietal labe | B = gyrus of the cerebrum | C = corpus callosum | D = frontal lobe

E = thalamus | F = hypothalamus | G = pituitary gland | H = midbrain

J = pons | K = medulla oblongata | L = cerebellum | M = transverse fissure | N = occipital lobe

Explanation:

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6 0

3 years ago

Which of the following are functions of lymphoid tissue? A. house and provide a proliferation site for lymphocytes B. house and

Genrish500 [490]

Answer:

The correct answer is option D. A and C.

Explanation:

Lymphoid tissue is the body part that is an essential part of the immune system that provides immune response against different infection or pathogens and protects from these foreign bodies. These tissues are present in all over the body that includes spleen, adenoids, tonsils, lymph nodes and other parts.

Lymphoid tissues or organs are the sites of the proliferation of the macrophages and lymphocytes. These structures also assist in furnishing surveillance points for lymphocytes and macrophages.

Thus, the correct answer is option D. A and C.

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3 years ago