Each gene has a specific location (locus) on a chromosome and may come in several forms (alleles). genotype The actual genes for a trait present in an individual. genotypic ratio The expected numbers of different genotypes produced by a particular cross.
Bones are made from calcium. A typical bone has an outer layer of hard or compact bone, which is very strong, dense and tough. Inside this is a layer of spongy bone, which is â¦ like honeycomb, lighter and slightly flexible.
Nearly all fossils are made from the hard parts, such as bones and teeth, because softer parts of animals and organisms do not last for as long a period of time. The soft parts decompose quicker and will not be left in the same place for a long period of time.