Explain basic concepts of single gene inheritance using the terms alleles, chromosomes,homozygous, heterozygous, dominant, recessive.

UNIT 3HEREDITY AND ENVIRONMENT1. Explain basic concepts of single gene inheritance using the terms alleles, chromosomes,homozygous, heterozygous, dominant, recessive.2. Your friends Fox and Dana are expecting a baby. Both Dana and Fox are farsighted andhave cheek dimples. Dana and Fox have said that they hope that their baby won't need towear glasses or have cheek dimples because they both hate their glasses and dimples. Ifyou know that cheek dimples are dominant over no dimples and farsighted vision isdominant over normal vision, what can you tell Fox and Dana about genetic inheritanceand the likelihood that they will get their wish?3. Explain how (a) twin studies and (b) adoption studies are used to determine the influenceof heredity on a trait and discuss a potential flaw of each type of study.4. Describe Down Syndrome — what it is, its causes, and its symptoms.