Answer:
a. It is present at high concentration at the anterior end and low concentration at the posterior end.
Explanation:
One of the ways to define the anterior-posterior axis in Drosophila is by the products of the Bicoid and Nanos genes. The mRNA from the bicoid gene is transcribed by nurse cells. The bicoid mRNA is deposited in the unfertilized egg near its anterior pole. Therefore, the bicoid gene product serves as the anterior morphogen. The bicoid mRNA is translated after fertilization. The Bicoid proteins are present in higher concentrations at the anterior end and diffuse through the cell to create a concentration gradient from the anterior to the posterior end.
Answer:
Primates with opposable thumbs include great apes -- chimpanzees, bonobos, orangutans and gorillas -- and Old World monkeys like baboons and Colobus monkeys.
Explanation:
The climax-pattern theory states that not only climate, but several other factors, determine the characteristics of the climax community.
Unlike, monoclimax and polyclimax theories which state that climate is the only determining factor, climax-pattern theory states that characters of the climax communities are determined by the total environment of the ecosystem not only by single factor.
According to climax-pattern theory, there are more climax communities that are continuous and varying gradually along environmental gradients.
They are mainly characterized as being corrosive, flammable, and explosive.
Most hazardous waste comes from the chemical and petroleum industries.