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alisha [4.7K]
4 years ago
13

I need help ! i really don’t get it

Biology
1 answer:
Vaselesa [24]4 years ago
5 0

Answer:

The presence of an additional chromosome

Explanation:

Look at "pair" 21. See how there are THREE chromosomes instead of TWO? Normally, there would only be two chromosomes in each pair but this karyotype shows a trisomy (see def. below) of the 21st pair. This was caused by a nondisjunction mutation of the 21st pair. The is also the karyotype of a person with Down's Syndrome.

Definition of Trisomy:

A condition of the presence of three chromosomes in a pair instead of two. This normally causes developmental irregularity.

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7. Normal color vision in the human is due to a dominant gene, C, and is x-linked. The recessive form of the gene, c, causes the
Vladimir79 [104]

Answer:

50% will be normal and 50% will be carriers

Explanation:

Color blindness is a reduced ability to distinguish between certain colours.

The condition is often inherited. Other causes include certain eye diseases and medication. More men than women are affected.

If such a carrier woman with normal vision (heterozygous for colour blindness) marries a normal man (XY), the following progeny may be expected in the generation: among the daughters, 50% is normal and 50% are carriers for the diseases; among sons, 50% are colour blind and 50% are with normal vision.

6 0
3 years ago
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How can an allopolyploid plant become a biologically fit new species? view available hint(s) how can an allopolyploid plant beco
Ilya [14]

Nondisjunction event during meiosis

Nondisjunction is a process whereby sister chromatid or homologous chromosomes failed to separate during cell division. During meiosis, Nondisjunction produce eggs or sperms cell that don’t have the normal number of chromosome. However, there are three forms of Nondisjunction which were:

<span> a) Failure of sister chromatids to separate during meiosis II</span>

b) Failure of a pair of homologous chromosome to separate in meiosis I

c) Failure of sister chromatids to separate during mitosis.

3 0
4 years ago
1. How has the human population size changed<br> throughout history?
wariber [46]

Answer:

<em>Like every other organism the population size of the humans have increased over time.</em>

Explanation:

With the improvements in science and technology, life becomes better and better for human beings. In the past, when there were no discoveries for curing diseases, the human population declined because of the spread of various diseases and famine conditions.

But as the developments in the scientific world are made, it has been easier to cure diseases and other problems. As a result, the population size of the human goes on increasing.

3 0
4 years ago
One alternative to autoclaving for sterilization of liquids is filtration. Imagine that you are using a filter to sterilize a dr
Strike441 [17]

Answer:

c. Fungi

d. Yeast

Explanation:

Both fungi and yeast will be effectively removed by a 0.22 micron pore size filter.

<em>The size of microscopic fungi ranges from 2 to 10 microns  while the size of yeast ranges from 3 to 4 microns in diameter. Hence, both organisms will be effectively filtered off by a 0.22 micron filter paper.</em>

The size of bacteria ranges from 0.2 to 2 microns while that of virus is in nanometer. Hence both cannot be effectively removed by a 0.22 micron pore size filter paper.

The correct options are c and d.

5 0
3 years ago
2. The billions of galaxies in the universe are organized into smaller groups of galaxies which in turn belong to
pantera1 [17]
I think it would be c. 1.5 because it is half the size. Also good luck for your quiz
7 0
3 years ago
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