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crimeas [40]
3 years ago
8

Which situation is a result of crossing-over during melosis?

Biology
1 answer:
Nuetrik [128]3 years ago
5 0

Answer:

During prophase I of meiosis, homologous chromosomes align in a process called synapsis to form a tetrad. In this formation, parts of non-sister chromatids can touch to form a chiasma. Here, parts of homologous chromosomes can be exchanged

Explanation:

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The earth's topography means its surface features.<br><br>True <br><br>False <br>​
Cerrena [4.2K]

Answer:

<h3>True</h3>

Explanation:

Topography is a detailed map of the surface features of land.

6 0
2 years ago
I need help with my homework that is due tomorrow and I can not find the answers in the book or online.
scoray [572]

Animal regeneration can produce whole organism or parts of organism and repair injury.

Clones today are done at genetic level by using molecular biology techniques as compared to old days when only nucleus would be removed from the egg cell and desired nucleus is inserted for cloning.

Explanation:

Regeneration is a process in which whole organism or part of which is produced from pre existing cells or group of cells and tissue. Regeneration helps in maintaining the integrity of morphology and physiology.

In lower animals like hydra and planaria whole organism is generated by existing parts. This process is termed as totipotency.

In higher animals however injury repair by mitosis is an example of regeneration.

Plant structure involved in vegetative propagation are: bulbs, rhizomes and tubers.

Vegetative propagation can be done by grafting, cutting, bulb formation, tuber, layering and tissue culture methods.

Cloning is a process in which a genetical or identical copy of an organism or the cell is made by molecular biology techniques. The use of DNA sequences, molecular scissors, stem cells and plasmid are the latest techniques of cloning.

Cloning is used for treating serious diseases as diabetes and heart injury.

In old days one cell would have its nucleus removed and placed into the egg and eventually organism produced

Advantages of tissue culture:

From a single explants, large number of plants can be made.

Obtaining plants of desired trait from tissue culture is easy in short span.

No seeds are required for the growing of new plants.

5 0
2 years ago
Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and ro
inna [77]

This question is incomplete because the options are missing; here is the missing section:

How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

by increasing carbon dioxide and decreasing oxygen

by increasing carbon dioxide and increasing oxygen

by decreasing carbon dioxide and increasing oxygen

by decreasing carbon dioxide and decreasing oxygen

The answer to this question is by increasing carbon dioxide and decreasing oxygen.

Explanation:

Rainforests have a vital role on Earth because these regulate the levels of oxygen vs carbon dioxide. This is because plants including trees, grasses, shrubs, etc. require carbon dioxide as part of the photosynthesis process, and they release oxygen at the end of the process. In this way, rainforests reduce the amount of carbon dioxide and increase oxygen.

In this context, deforestation or the destruction of rainforest for mining, roads, etc. implies there are fewer plants, and therefore, less carbon dioxide is being used and less oxygen is released. This causes an increase in carbon dioxide and a decrease in oxygen.

9 0
3 years ago
Which of these statements best describes what Charles Darwin observed on the Galápagos Islands? The finches on the islands were
yKpoI14uk [10]
The finch population on each island was unique. (correct statement) This is due to evolution, the finches beak size is a good example as the nuts on each island were different and the larger/smaller a beak was, it represented  a change in the finch population so that they could break open the nuts easier.
6 0
3 years ago
What part of the cell serves as the intracellular highway?
erastovalidia [21]

Answer:

will you please help me with my question pleasee

Explanation:

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7 0
2 years ago
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