The genotype for a specific trait is written with two letters such as BB, Bb, or bh, and a cross for a trait can be written BB x Bb. What do the two letters of the genotype represent? An organism's outward appearance is its phenotype.

An organism's genotype is a result of its phenotype.

Genes for a tralt come from either the mother or father but not both parents.

Traits are passed from both parents to offspring through pairs of genes

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.