The options that described Mendel's law of segregation include 1, 2, and 3.
According to the law of segregation, Mendel opined that genes separate into their component alleles during the formation of gametes, each gamete takes up either of the alleles, and gametes of males and females randomly unite during fertilization.
Thus, according to Mendel, if a cell has a genotype that is AA, there would be A and A gametes at the end of gametogenesis, if the genotype is Aa, there would be A and a gametes, etc.
In other words, organisms that are homzygous would produce the same games while those that are heterozygous would produce different gametes.
Also, Mendel further showed that gametes from the same parents do not unite during fertilization but gametes from different parents (male and female) do. Thus, the random union of gametes is only applicable to those of different sexes.
Considering all these postulates, one can effectively conclude that statements 1, 2, and 5 all describe the law of segregation.
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