Answer:
Otherwise, his dihybrid crosses would not have produced a 9 : 3 : 3 : 1 ratio of F2 phenotypes.
Explanation:
The random separation of alleles of different genes to the opposite poles of the cell requires that the genes are present on the different chromosomes. In this case, the random segregation of alleles of two genes produces new allele combinations in the progeny. The genes may be present on the same chromosome. These linked genes do not exhibit the random separation of their alleles.
Mendel obtained the 9:3:3:1 ratio since the two genes of a dihybrid cross were present on the different chromosomes. This allowed the independent assortment of their alleles. If the genes were linked, he would have obtained more of the parental types and less or no recombinant progeny in the F2 generation. Therefore, the F2 phenotypic ratio would have deviated.
Answer: The cell bodies of sensory neuron are located in the dorsal gangalia of the spinal cord.
Explanation:
Sensory neurons are neurons of the central nervous system that help to convert some particular type of stimulus through their receptors into action potentials. It is also called afferent neurons. The cell bodies of sensory neurons is located in the dorsal gangalia of the spinal cord. The sensory neurons is divided into two; the external receptors which respond to stimuli from outside and the internal receptord which respond to stimuli from inside through their receptors.
The external include smell, taste, vision ,auditory receptors while the internal receptors are blood, noicereceptors.
Answer:
D. Tap water is one of the three test conditions of the independent variable, the type of water.
Explanation:
An independent variable is the part of a science experiment that is changed. Since you are changing the type of water, the independent variable would be the water. There are 3 types of water in this experiment, meaning the tap water is one of the 3 test conditions of the independent variable.