The randomness in the alignment of recombined chromosomes at the metaphase plate, coupled with the crossing over events between nonsister chromatids, are responsible for much of the genetic variation in the offspring. To clarify this further, remember that the homologous chromosomes of a sexually reproducing organism are originally inherited as two separate sets, one from each parent. Using humans as an example, one set of 23 chromosomes is present in the egg donated by the mother. The father provides the other set of 23 chromosomes in the sperm that fertilizes the egg. Every cell of the multicellular offspring has copies of the original two sets of homologous chromosomes. In prophase I of meiosis, the homologous chromosomes form the tetrads. In metaphase I, these pairs line up at the midway point between the two poles of the cell to form the metaphase plate. Because there is an equal chance that a microtubule fiber will encounter a maternally or paternally inherited chromosome, the arrangement of the tetrads at the metaphase plate is random. Thus, any maternally inherited chromosome may face either pole. Likewise, any paternally inherited chromosome may also face either pole. The orientation of each tetrad is independent of the orientation of the other 22 tetrads.
Explanation:
Answer:
Option D
Explanation:
Complete question
which of the following properties of water are essential for life on Earth?
A) polarity
B) Cohesion & Adhesion
C) High heat capacity
D) All the above
Solution
Some essential properties of water are as follows –
a) Polarity
b) Solvent
c) High heat capacity - it is essential to maintain the temperature on earth. The water bodies are comparatively cooler than the temperature of earth
d) High heat of vaporization
e) Cohesion – It is essential for surface tension & capillary action
f) Adhesion – It is essential for surface tension & capillary action
g) Lower freezing density – Due to this reason, ice is lighter than water
Hence, option D is correct
Answer:
The child is suffering from measles which is caused by the measles virus. It is also known as rubeola.
Explanation:
The infection is measles because the child is suffering from sore throat, headache, high fever and a cough. White spots with red margin also develop on the mucous membrane of the mouth after a couple of days. These symptoms are seen in measles infections.
The white spots which develop inside the mouth are known as koplik’s spots.
The measles is an airborne disease and spreads through the cough and sneezes of a person who is infected with it. Measles is very contagious . The measles virus spreads in the body for 10-14 days after infection, then mild fever, cough and runny nose lasts for 2-3 days. In the next few days , the rash spreads over the body and there is high fever.
Learn more about measles here:
brainly.com/question/14470747
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It was to help black slaves and poor white people in the south after the Civil War.
<span>Stamen produces pollen so the best answer is stamen.
I hope it helped :)</span>
