19. Generally, there are two copies of a set of genes in body cell, then how
cells make a single set of genes?
20. What is variable resistance ?
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19. There are 22 chromosomes pairs (autosomes) and a pair of sex chromosomes (allosomes). Thus, a single set of genes is formed from the two copies. ... Meiosis, therefore, helps the germ cells make a single set of genes (haploid) from the normal two copies (diploid).
20. Potentiometer
A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
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19) There are 22 chromosomes pairs (autosomes) and a pair of sex chromosomes (allosomes). Thus, a single set of genes is formed from the two copies. ... Meiosis, therefore, helps the germ cells make a single set of genes (haploid) from the normal two copies (diploid).
20) A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.
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