What is "twinkling"? (in telescopes)
A. Flashing of quickly revolving starts
B. Distortion of light in the very large mirrors of refracting telescopes caused by moving air currents
<u>C. Distortion of light by lenses more that three feet across due to sagging class </u>
D. Interference between the lenses of a refracting telescope that distorts the final image
Answer:
C. III, VII, IX, and X
Explanation:
The parasympathetic division of autonomous nervous system is also known as craniosacral division. The cell bodies of preganglionic neurons of parasympathetic division are located in the lateral gray matter of sacral segments (S2-S4) of spinal cord and in the nuclei of four cranial nerves in the brain stem. These cranial nerves as namely: oculomotor nerve (III), facial nerve (VII), glossopharyngeal nerve (IX), vagus nerve (X).
Answer:
Multiple alleles can modify the classical Mendelian ratio by increasing the number of phenotypes.
For example, in a monohybrid cross, Mendel gets only 2 phenotypes however, in ABO blood groups (a classical example of multiple alleles) there are four phenotypes present in a population.
Lethal alleles are the alleles which when expressed result in the death of an organism. These alleles can be dominant, recessive or conditional (depends on interaction with another gene).
Thus, lethal allele reduces the ratio of the phenotype associated with it by affecting the survival of the organism.
For example, lethal yellow allele in mice results changes the phenotype ratio from 3:1 to 2:1