The instructions that make us what we are, are found in our . This genetic information is passed on to us by our .
An allele can be recessive or dominant. A allele overrides a one. Some characteristics always shows, if the individual has atleast one copy of the allele. Other characteristic only shows if the individual has two copies of the allele. This can be shown in a Punnett Square:
This can be shown in a Punnett Square:
However some differences in the characteristics of individuals may be to environmental causes. Height and growth, for example, is also affected by nutrition as well as genes.
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