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ira [324]
3 years ago
12

How does crossing over add to the genetic diversity of sexually reproducing organisms

Biology
1 answer:
Jlenok [28]3 years ago
6 0
Crossover is the first way that genes are shuffled to give rise to genetic diversity. Crossover takes place in sexual reproduction. Chromosomes line up side by side and break off pieces of themselves, then trade those pieces with each other. When they break at the same place (locus) in the sequence of base pairs, the result is an exchange of genes called genetic recombination. That is the normal way for crossover to occur. Genetic recombination ensures that the daughter cells produced have a different genetic makeup from the parent cell and thus diversity is created.
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In the theory of plate tectonics, how should you picture the earth?
lorasvet [3.4K]

Answer:

C

Explanation:

As shown in the picture I attached to my answer, we can see all of the tectonic plates, which make up the lithosphere. The pieces do move very slightly every year.

5 0
1 year ago
Darwin had very few fossils to support his theory of evolution by means of natural selection when he published On the Origin of
Rama09 [41]

Answer:

Fossils plays an important role in the field of biological study. It is because it acts as key evidence for the evolution that has been occurring on earth since the time of origin of earth.

These fossils are valuable as they are found to be embedded in the sedimentary rocks of about millions and billions of years old. The study of these fossils enabled scientists to understand how life evolved from single-celled organisms to the present day complex organisms. The initially occurring organism was comparatively small and soft-bodied, and so are rarely found. But in today's world, the organisms existing are much different and structured in a well-defined pattern, and this helped in the understanding of the evolutionary pattern of life on earth and also explains the key factors that are responsible for the occurrence of evolution.

Thus, these fossils are considered to be very much essential for studying biological evolution.

6 0
4 years ago
DOMAINS AND KINGDOMS
iVinArrow [24]
For the first question, a unicellular eukaryote with autotrophic features (meaning it can produce its own food) will be from either Domain Bacteria and Domain Eukarya, but since Domain Bacteria is not in the choices, then Domain Eukarya is the answer. Domain Archaea are yes, unicellular organisms, but they are not eukaryotes and they do not possess autotrophic features. Domain Eukarya have photosynthetic protozoans (i.e. Diatoms).

For the second question, in Kingdom Fungi, you chose that fungi can either be unicellular or multicellular, which is true, for instance yeast and mushrooms respectively. Fungi are heterotrophic as they cannot produce their own food. The other answer is that fungi are eukaryotic organisms since their cells have a true nucleus and they belong to Domain Eukarya.

For the third question, in Kingdom Protista, you chose that protists can either be unicellular or multicellular, and this is true in the case of amoebas and kelp respectively. Protists can be both heterotrophic and autotrophic. The other answer is that protists are eukaryotic organisms since their cells have a true nucleus and they belong to Domain Eukarya.
8 0
3 years ago
Choose all correct answers. Select two options.
klasskru [66]

Answer: Starches and sugar

Explanation:

5 0
3 years ago
Why do we need to start using more renewable energy sources and rely less on on fossil fuels
Aneli [31]

Answer:

Fossil Fuels pollute the earth and add to the greenhouse effect which in turn breaks down our atmosphere. Which is global warming (broken down atmosphere letting in radiation)

Explanation:

3 0
3 years ago
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