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Questions Q1. Cells in a human body can be haploid or diploid. When an egg cell combines with a sperm cell a fertilised egg, known as a zygote, is formed. (i) Which row of the table gives correct information about the egg cell, the sperm cell and the zygote? (1) Put a cross ( ) in the box next to your answer. %%% egg cell sperm cell zygote diploid diploid haploid A diploid haploid diploid B haploid diploid haploid C haploid haploid diploid D (ii) The single cell of the zygote divides into two cells in 15 hours. These cells continue to divide in this way to form an embryo. The diagram shows an embryo with 32 cells. Calculate the length of time it takes the single cell of the zygote to form an embryo with 32 cells. (2) answer = .............................................................................. hours (iii) The cells of this embryo are genetically identical. Explain how these genetically identical cells are produced. (3) .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. ..............................................................................................................................................
