Chance or probability is the basis of genetic inheritance. what genes you inherit from your parents is nothing more than "chance". in this punnett square you can see the possible genes for fur color of mice. b is the gene for black and b is the gene for white. if you are black, the pair of genes you possess must be bb or bb. if your fur is white you have the combination bb.

it has one origin of replication, but it proceeds in two directions - d)

1) a giant star is a star with a radius much larger than that of our sun (even hundreds of times bigger). they can be either blue giants or red giants: in the first case, the surface temperature is very high, higher than that of the sun, while in the second case the surface temperature can be lower than that of the sun. the same applies to the mass: blue giants are very massive stars, burning quickly their nuclear fuel, while red giants can have small masses (a little bit bigger than that of our sun).

2) we can find giant stars in the upper part of the hr diagram, blue giants will be on the upper left corner since they have high luminosity and high temperature, while red giants will be on the upper right corner, having high luminosity but low temperature.