A quick source of carbohydrates would be a chocolate bar because chocolates are full of carbohydrates, or he could have one of those granola bars since they are full of oats and wheat and these are also carbohydrates. He could also have some pasta or anything similar since it is a good source of carbohydrates too.
Two chromosomes that are similar but not identical are called homologous chromosomes. When the chromosomes are duplicated, two identical chromosomes are called sister chromatids.
