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iGCSE revision powerpoint 4

This comprehensive PowerPoint covers key topics in iGCSE biology, including 79 questions on sexual and asexual reproduction, the male and female reproductive systems, the menstrual cycle, inheritance, genetic crosses, mitosis, meiosis, glasshouses, fish farming, and genetic engineering.

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iGCSE revision powerpoint 4

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  1. iGCSE revision powerpoint 4 There are 79 questions

  2. Reproduction 1 – 2 Give two differences between sexual and asexual reproduction. • What is a gamete? • What is produced when gametes join at fertilisation?

  3. Male reproductive system 5-12 – Start top left 13 Where are the sperm made? 14-15 which two parts produce fluid to nourish sperm?

  4. Female reproductive system 16-20 top to bottom 21 – proper name for an egg? 22 – where are eggs produced? 23 – where could they be fertilised?

  5. Menstrual cycle 24 – how many days is the average cycle? 25 – on which day is an egg released? 26 – 27 which two hormones are released from the ovaries? 28 – 29 give one function of each of these hormones.

  6. Reproduction in plants 30-37 on diagram 38 what is pollination? 39 how does the pollen reach the ovum? 40 – how can plants reproduce asexually?

  7. Inheritance 41 – what is the thing on the left? 42 – how many of these in a human? 43 – what’s on the right? 44 – what do the square brackets show?

  8. Inheritance 2 45 – what is an allele? 46 – what word describes an allele where only one copy is needed for the feature to show? 47 – the opposite of number 46. 48 – what does homozygous mean? 49 – what does heterozygous mean? 50 – what does genotype mean? 51 – what does phenotype mean?

  9. Genetic cross 52 – which characteristic is dominant? 53 – what colour will the offspring be? 54 – if the offspring had babies, what ratio would their colours be? 55 – which sex chromosomes are female?

  10. Mitosis If a cell has chromosomes in pairs we describe it as d......56............, if they are single it is h........57........... During mitosis, the cell divides o.....58....... , producing t.......59........ daughter cells which are genetically i.......60......... to the original cell. Mitosis occurs during g.....61......., r.....62......., c......63........ and a......64...... reproduction.

  11. Meiosis During meiosis, the cell divides .........64............ , producing ...........65............. daughter cells, each with ...........66............ of the original number of chromosomes. This produces genetically ...........67.......... cells.

  12. Glasshouses 68 – 70 Give three ways in which you could increase the yield of crops in glasshouses. 71 Give a definition of biological control (of pests)

  13. Fish 72 – 74 Describe three things that are done to farmed fish to increase their numbers.

  14. Genetic engineering 75 – What do we call enzymes that cut DNA at specific sites? 76 – What do we call enzymes that are used to join pieces of DNA together? 77 – What is a plasmid? 78 – What is a vector? 79 – How do you grow large numbers of GM bacteria?

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