reproduction

• cells which contain two sets of chromosomes are called diploid in humans these cells have 46 chromosomes or 23 pairs
• diploid cells are muscle cells, bone marrow cells and white blood cells
• diploid cells are also cheek cells, skin cells and liver cells
• cells which contain one set of chromosomes are called haploid in humans these cells have 23 chromosomes only gametes are haploid
• haploid cells in animals are sperm and egg (ovum)
• in plants haploid cells are pollen and ovule
• red blood cells are neither haploid or diplod because they have no nucleas
• fertilisation is the fusion of nuclei of the two haploid gametes to produce a diploid zygote
• This zygote divides to form an embryo. in humans when the sperm and egg join genetic material from the each mixes to form the zygote.
• fertillisation occurs in the oviduct