Answering all will be given
1. what is a genotype?
2. what is a phenotype?
3.what is the meaning of heterozygous?
4. what is the meaning of homozygous?

1. t he constitution (that is genetic)  of an individual organism.

2. t he set of characteristics that are observable  of an individual resulting from the interaction of their genotype with the environment.

3. a   pair of genes where one is dominant and one is recessive and they're different. 

4.  alternative forms of a given gene are called alleles, and they are either dominant or recessive. they are homozygous when an individual has two of the same allele whether dominant or recessive. 

hope this you! : -)