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Sexual & Asexual Reproduction
01/06/2023
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SEXUAL & ASEXUAL REPRODUCTION Human cells contain 23 pairs of chromosomes (46 chromosomes) These cells are diploids contains 2 complete sets of chromosomes) These cells can divide by mitosis one cell is copied into two identical cells Gametes (sex cells) contain only 23 chromosomes They are haploids H In humans, the gametes are sperm cells and egg cells MITOSIS & MEIOSIS Mitosis is a type of nuclear division that gives rise to cells that are genetically identical. It is used for growth, repair of damaged tissues, replacement of cells and asexual reproduction. Meiosis is a type of nuclear division that gives rise to cells that are genetically different. U It is used to produce gametes (sex cells). SEXUAL REPRODUCTION Sexual reproduction is a process involving the fusion of the nuclei of two gametes (sex cells) to form a zygote (fertilised egg cell) and the production of offspring that are genetically different from each other. The gametes of animals are the sperm cells and egg cells The gametes of flowering plants are the pollen cells and egg cells Fertilisation is defined as the fusion of gamete nuclei, and as each gamete comes from a different parent, there is variation in the offspring The formation of gametes involves meiosis ASEXUAL REPRODUCTION Asexual reproduction does not involve sex cells or fertilisation Only one parent is required so there is no fusion...
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Alternative transcript:
of gametes and no mixing of genetic information As a result, the offspring are genetically identical to the parent and to each other (clones) Asexual reproduction is defined as a process resulting in genetically identical offspring from one parent Only mitosis is involved in a sexual reproduction.