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Genetic Variation

Genetic Variation. Genetics. Genetics is the study of inheritance. The passing on of characteristics/traits from the birth mother & father to their offspring. Most life begins as a fertilised ovule called a zygote or embryo. Animals:. Zygote/ embryo. Sperm. +. Egg/Ovule. Male gamete.

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Genetic Variation

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  1. Genetic Variation

  2. Genetics Genetics is the study of inheritance. The passing on of characteristics/traits from the birth mother & father to their offspring

  3. Most life begins as a fertilised ovule called a zygote or embryo. Animals: Zygote/ embryo Sperm + Egg/Ovule Male gamete Female gamete Formed in: testes ovary

  4. Plants: Pollen Zygote + Ovule Male gamete Female gamete Formed in: anther ovary

  5. Questions Does growth and development stop at fertilisation? … at birth? How does the one cell zygote know what to do to become a mature member of its species?

  6. Genetic Code The genetic code is the instructions for how a zygote grows and develops into a mature organism. The genetic code is found in the nucleus of cells.

  7. Chromosomes From Advanced Biology for You

  8. Chromosomes Chromosomes are found in nucleus of cells They come in pairs of similar shape and size called homologous pairs. Exception – sex chromosomes, X & Y differ in size and shape Females: XX Males: XY

  9. Each species has a unique number of chromosomes e.g. humans – 46 chromosomes Scientists arrange the chromosomes in pairs from longest to shortest. They call this pattern a karyotype.

  10. The human karyotype What does this tell us about human chromosomes?

  11. Gametes contain half the number of chromosomes found in the body cell. One from each homologous pair

  12. Complete the Table

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