Answer:
Option A
Explanation:
Options
A. most populations were fixed for a single genotype, but genotypes varied among populations
B. average heterozygosity was declining steadily over time
C. individual populations were polymorphic for several loci and most populations were genetically similar to one another
D. all populations were fixed for the same allele at each locus studied
Solution
As per the study conducted by Templeton, it was found that human affect the biodiversity at all biological levels such as genetic, ecosystem, species etc. and behind genetic variation two important factors are genetic drift and gene flow.
Both the gene flow and genetic drift produce opposite results as genetic drift increase variation with in the species but decrease variation with in the local population and the opposite of this happens in gene flow.
Genetic drift has actually lead to speciation of collared lizards among themselves for a specific genotype
Hence, option A is correct
Yes the mitochondria is essential for both plant cells and animals cuz it’s the powerhouse of the cell
<span>For a cell with nucleus to divide successfully, it needs to prepare for cell division by growing, accumulating nutrients needed for mitosis and duplicating its DNA. The duplicated DNA will eventually be distributed between the two new cells formed. The correct option is A.</span>
1. CSF stands for Cerebrospinal Fluid. Cerebrospinal fluid analysis is usually done to investigate the presence of infective agents in the brain. The CSF is produced by the choroid plexus which is located in the brain. After production, the fluid is released into the blood stream and it is reabsorbed and replaced every few hours. The fluid flows around the brain and the spinal cord and provides protection for the organs, it also carry away their wastes. Thus, the CSF from the spinal cord will give one information about the condition of the brain because, the CSF in the spinal cord is continuous with that in the brain, therefore any foreign object that is present in the brain will also be seen in the CSF fluid of the spinal cord.
2. If the spinal needle is accidentally inserted into the epidural space, it must be withdrawn immediately. This is necessary in order not to pierce and consequently damage the spinal cord. This may result in paralysis. Epidural space is only used for administration of therapeutic substances, spinal injection must not be inserted in the epidural space. <span />
