Explanation:
The evolution of egg was the most important evolutionary incident which allowed the evolution of the terrestrial animals. The amnion is the layer inside the chorion of the egg which keeps the embryo from drying out.
The formation of this layer completely removed the dependency of the organism to lay their eggs in the water to keep them wet.
This layer allowed the reptiles to lay their eggs on the land as the amnion can protect the embryo from drying out. The other layer of eggs protects the egg from the predators and the pathogens.
Thus, the evolution of the amniotic egg is very important from the evolutionary perspective.
The question is incomplete as it lacks the question and has only information regarding the question. however, the correct question is as follows :
How many different genes are contributing to the wingless phenotypes in these mutant fly strains?
Answer:
The correct answer is - Two genes.
Explanation:
In the given question there are two mutation groups based on the given seven results:
1st group :
Mutations 1, complement with 2,4, and 7 and also complement each other, thus, are on the same gene.
2nd group:
Mutations 3, 5, and 6 did not complement each other but complemented with mutations 1, 2, 4, and 7. Thus, these three mutations are present together on a different gene.
Answer:
"During cell division, a mother cell divides into two daughter cells, and during this process, the DNA in the mother cell, wrapped up in the form of chromosomes, is divided into two equal sets. ... This finding gives us a glimpse of an important step in the process of cell division."
Explanation:
Maria must be suffering from cystic fibrosis because all the given symptoms are symptoms of this disease. There might be other symptoms that her parents might have missed.
<u>Explanation:</u>
Wheezing, salty skin and low weight gain etc are the most evident symptoms of cystic fibrosis. Cystic fibrosis is a genetic disorder that is inherited in an autosomal recessive manner. The disease mainly affects the lungs but it can also affect the liver, pancreas and kidney.
Sweat test and genetic testing are some of the diagnostic methods of cystic fibrosis. Greasy bowel movement is also a symptom of cystic fibrosis which Maria’s parents might have missed.
