The oxygen-rich surface water blends with the deeper, depleted water. The dissolved oxygen concentration in the mix can be too low to support life in the pond. Both fish and plankton can die from low dissolved oxygen following a turnover. Thus, turnover can happen if a cold rain and wind cools the surface water.
Answer:
The top of a worm is the dorsum or it can be said to be the
dorsal surface.
Answer:
Frequency of the B3 allele ![= 0.1](https://tex.z-dn.net/?f=%3D%200.1)
Explanation:
The allele frequencies in a given population remain constant which means that every generation will have the same gene pool across the generations. As per Hardy Weinberg’s first equilibrium equation, the sum of frequency of all the alleles at a given locus is equal to one
Thus, if "p" represents the frequency of B1 allele and "q" represents the frequency of B2 allele and "r" represents the allele for B3 allele. Then, sum or "p", "q" and "r" is equal to one.
![p+q+r = 1\\](https://tex.z-dn.net/?f=p%2Bq%2Br%20%3D%201%5C%5C)
Substituting the given values, we get -
![0.5 + 0.4 + r = 1\\0.9 + r = 1\\r = 1-0.9\\r = 0.1](https://tex.z-dn.net/?f=0.5%20%2B%200.4%20%2B%20r%20%3D%201%5C%5C0.9%20%2B%20r%20%3D%201%5C%5Cr%20%3D%201-0.9%5C%5Cr%20%3D%200.1)
Answer:
Genetic engineering is accomplished in three basic steps. These are (1.) The isolation of DNA fragments from a donor organism; (2.) The insertion of an isolated donor DNA fragment into a vector genome and (3.) The growth of a recombinant vector in an appropriate host.