Genetic Variation

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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. - PowerPoint PPT Presentation

Text of Genetic Variation

Genetic Variation

Genetic VariationGeneticsGenetics is the study of inheritance.The passing on of characteristics/traits from the birth mother & father to their offspringMost life begins as a fertilised ovule called a zygote or embryo.Animals:Male gameteFemale gameteFormed in:Sperm Egg/OvuleZygote/embryo

+testesovary

Plants:Male gameteFemale gameteFormed in:Pollen OvuleZygote

+antherovary

QuestionsDoes 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?Genetic CodeThe 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.

Chromosomes

From Advanced Biology for YouChromosomesChromosomes are found in nucleus of cellsThey come in pairs of similar shape and size called homologous pairs.Exception sex chromosomes, X & Y differ in size and shapeFemales: XXMales: XYEach species has a unique number of chromosomes e.g. humans 46 chromosomesScientists arrange the chromosomes in pairs from longest to shortest. They call this pattern a karyotype.

What does this tell us about human chromosomes?The human karyotypeGametes contain half the number of chromosomes found in the body cell. One from each homologous pair

Complete the TableSpeciesBody CellMale gameteFemale gameteHuman23Rat19Pea14Fruit Fly4Horse66