I do not think that testing should be done on animals. Why are you testing human products on animals in the first place? Test products that you want to use on the people that will it be given to.
Answer:
The haploid gametes are formed by meiosis, a cellular process that involves two cell divisions and one round of DNA synthesis (i.e., four gametes with haploid DNA content). Subsequently, the gametes are fused during the fertilization to produce a diploid zygote. Finally, the zygote undergoes successive mitotic cell divisions where specific genes are expressed, this process enables the development of an embryo with different tissues and organs.
If your parents have it you have about 55 % chance in getting it
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