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3 years ago

When a protist divides are the daughter cells the same as the parent

Biology

1 answer:

maria [59]3 years ago

5 0

Answer:

In eukaryotes, there are two distinct types of cell division; a vegetative division, whereby each daughter cell is genetically identical to the parent cell (mitosis), and a reproductive cell division, whereby the number of chromosomes in the daughter cells is reduced by half to produce haploid gametes (meiosis).

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In 2006, scientists discovered fossilized skeletons of an animal with several interesting features. Fossil evidence indicated th

vlada-n [284]

Answer:

The preferable statement will be - D.

D. They show a transitional form between fish and land-dwelling vertebrates.

Explanation:

From the given information we know that the fossil of that type of animal has scales, fins, gills, lungs, a full set of ribs, and limb bones.

This indicates some things such as,

There is a high chance that the animal was capable of living in both land surface and water.

Scales, fins, and gills indicate that they were like fish or water vertebrates.

But lungs, a full set of ribs, and limb indicates that they are showing a transitional form between water and land-vertebrates.

8 0

3 years ago

In separate marshes, small populations of three species occur: grass fish, which disperse only in extreme rains and have an aver

Volgvan

The question is incomplete as it does not have the option which are:

a. Grass fish, since they have the least gene flow, and gene flow acts to decrease genetic variation among populations.

b. Swamp rats, since they will have the best balance between genetic drift and gene flow, resulting in high genetic variation among populations.

c. Grass fish, since they are the best adapted to their aquatic environment, and adaptation increases genetic variation among populations.

d. Marsh birds, since they have the highest level of gene flow, and gene flow increases genetic variation among populations.

e. It is not possible to compare relative amounts of genetic variation among such different kinds of animals.

Answer:

Option-A

Explanation:

The genetic variations are introduced in a population when the new combination of gene interact with each other and again a new combination of genes are formed.

This genetic variation is possible when the flow of gene takes place that is the individuals are dispersed to another place.

In the given population, since it has been mentioned that the gene flow of Grass fish was very low because the probability of gene flow was 1 out of 45. Thus, the gene flow was very less, therefore, the less genetic variation is introduced in population.

Thus, Option-A is correct.

8 0

3 years ago

Which genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines?

galina1969 [7]

Answer: Cystic Fibrosis

Explanation:

Cystic fibrosis (abbreviated CF) is an autosomal recessive genetic disease that mainly affects the lungs, and to a lesser extent the pancreas, liver and intestine, causing an abnormally thick, sticky mucus to build up in these areas. This mucus collects in the airways of the lungs and pancreas. The main cause of morbidity and mortality is pulmonary involvement, which accounts for 95% of deaths, mainly due to repeated infections caused by bronchial obstruction due to the secretion of very thick mucus.

This build up of mucus causes life-threatening lung infections and serious digestive problems. It is one of the most common types of chronic lung disease in children and young adults, and is a life-threatening disorder; patients often die from lung infections due to Pseudomonas or Staphylococcus.

It is a hereditary disease produced by a mutation in the gene encoding the cystic fibrosis transmembrane conductance regulator (CFTR) protein. This protein is involved in the passage of chlorine ion through cell membranes and its deficiency alters the production of sweat, gastric juices and mucus. The disease develops when neither allele is functional. Over 1500 mutations have been described for this disease, most of which are small deletions or point mutations; less than 1% are due to mutations in the promoter or chromosomal rearrangements. However, many people carry the CF gene, but do not have any symptoms. This is because a person with this disease must inherit 2 defective genes, 1 from each parent.

There is no curative treatment, however there are treatments that allow the improvement of symptoms and extend life expectancy. In severe cases, the worsening of the disease may necessitate a lung transplant.

3 0

3 years ago

Solar, wind, and hydroelectric energy are examples of resources.

strojnjashka [21]

Answer:

Renewable Energy Resources.

Explanation:

Unlike fossil fuels which cannot be recovered when destroyed, these sources of energy can be recovered by a means of recycling . Recycling here reduces solid wastes which is one of the causes of land pollution.

Hydroelectric schemes can only be built in mountain regions where rainfall and rivers are plentiful which involves upset of aquatic ecosystem. This poses a dangerous pollution problem though.

Wind generators and solar panels are not very efficient energy producers. However, future schemes for producing solar energy via solar satellites are promising.

7 0

3 years ago

Read 2 more answers

What is the function of the enzyme topoisomerase in dna replication?

amm1812

Answer:

Topoisomerase is an enzyme which participates in the unwinding of DNA helix.

Explanation:

During transcription and DNA replication, the DNA needs to be unwound in order for the transcription/replication machinery to gain access to the DNA so it can be copied or replicate, respectively.

5 0

4 years ago