6.sex cells and fertilisation

Sex Cells and Fertilisation Sexual Reproduction

Sexual Reproduction ,[object Object],[object Object]

Sexual Reproduction (plant) Petals Anther Filament Nectary Sepal Ovule Style Stigma Ovary Stamen }

Sexual Reproduction (plant) Pollen Tube

Sexual Reproduction (mammal) Nucleus – contains information in chromosomes Cytoplasm – contains food store Head Tail – allows sperm to swim to egg

Sexual Reproduction (mammal) Fertilisation is when the two nuclei fuse

Sexual Reproduction Notes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Sex Cells and Fertilisation Genetics

Genetics Notes ,[object Object],[object Object]

Genetics The number of chromosomes present in an organisms’ cells depends on its species. e.g Human Male 46 Chromosomes

Genetics The thread-like chromosomes are made of a chemical substance called DNA. DNA carries coded genetic information. DNA has two strands which form a twisted structure called a helix. Each piece of information is called a gene.

Genetics ,[object Object],[object Object],[object Object],[object Object],A A C T G C C G T A T G Adenine (A) Thymine (T) Guanine (G) Cytosine (C)

Genetics A A C T G C C G T A T G The genetic code found in genes gives the cells instructions to make protein molecules. ,[object Object],[object Object],[object Object]

Genetics ,[object Object],[object Object]

Genetics ,[object Object],[object Object],Each amino acid is different depending on the combination of bases (e.g. CGT, TGC, AAG etc) Amino acid Amino acid Amino acid Amino acid

Genetics The amino acids are linked together to make a protein. The sequence of amino acids dictates the structure and function of the protein. Amino acid Amino acid Amino acid Amino acid Protein molecule

Genetics Notes ,[object Object],[object Object],[object Object],[object Object]

Fertilisation Mini Essay Describe how and where fertilisation occurs in a flowering plant. For Wednesday 15 th December

Sex Cells and Fertilisation Gamete Production

Gamete Production Notes ,[object Object],[object Object],[object Object]

Gamete Production Chromosome Chromatid Chromatid Centromere Centromere Centromere

4 gametes produced. Gamete Mother cell. 4 double chromosomes. Matching chromosomes pair. Line up across cell Pairs separate. Cell divides. Chromosomes line up. Each cell divides again. Centromeres split Chromatids pulled apart

Gamete Production Notes ,[object Object]

Sperm Mother cell Egg Mother cell Cell ready to divide again Sperm cell Egg cell MEIOSIS Zygote FERTILISATION

Sex Cells and Fertilisation Sex Determination

Sex Determination Notes ,[object Object],[object Object],[object Object]

Sex Determination Notes ,[object Object]

Gamete Production ,[object Object],[object Object],[object Object]

Gamete Production ,[object Object]

Sex Cells and Fertilisation Genes and Alleles

Genes and Alleles Note ,[object Object]

Genes and Alleles Note ,[object Object],[object Object]

Genes and Alleles Note ,[object Object],[object Object],[object Object]

6.sex cells and fertilisation

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6.sex cells and fertilisation