b)+Inheritance+-+(mono-hybrid+crosses+and+sex+determination)

Section 3- Reproduction and inheritance a) Reproduction (plants) - a) Reproduction - (humans) - b) Inheritance (chromosomes, genes and DNA) - b) Inheritance - (mono-hybrid crosses and sex determination) - b) Inheritance - (cell division and variation) - b) Inheritance - (evolution)

b) Inheritance - (mono-hybrid crosses and sex determination)
How Mendel's pea plants helped us understand genetics by Hortensia Jiménez Díazis a good introduction to Mendelian interitance Who was Gregor Mendel? This is a short introduction on his life
 * Starter**

3.17 understand the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, genotype and codominance 3.18 describe patterns of monohybrid inheritance using a genetic diagram 3.19 understand how to interpret family pedigrees 3.20 predict probabilities of outcomes from monohybrid crosses 3.21 understand that the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male 3.22 describe the determination of the sex of offspring at fertilisation, using a genetic diagram
 * Learning outcomes (s//tudents will be assessed on their ability to)//**

Harlem's DNA Lab's has an Interactive lab to help learn about Mendelian genetics
 * Labs**

This topic you will be building just a short set of notes according to the guidance below. After that most of understanding of mono-hybrid crosses, pedigree diagrams and sex determination is build from practise. The summary questions are designed to aid this process.
 * Approach**

__Note creation__ Use the learning outcomes as headings. Complete your notes using the guidance below. Keep your notes brief. Remember most of your learning will come from practise.

3.17 //Write out the definitions for each term (dominant, recessive, homozygous, heterozygous, phenotype, genotype and codominance) and for each definition add an example to make it clearer. Use your own words.//

3.18 and 3.20 //Draw out an example of a Punnett square (genetic diagram). Include the following elements:// //o Phenotype of the parents// //o Genotype of the parents// //o Alleles present in the gametes// //o Punnett square to show possible combinations of alleles in offspring// //o Summarise the offspring genotype as ratios// //o Summarise the offspring phenotypes as ratios// //Add annotations to describe each of the elements and why it is important to have it in the diagram// //Describe what a ‘test cross’ is and why it is used (your green book will be helpful for this)//

3.21 and 3.22 //Use a Punnett square or a genetic diagram to show sex determination in humans. Annotate to explain what you are showing.//

3.19 //Watch the Click4Biology video on family pedigree and take brief notes to aid your understanding.//

__Summary questions__ media type="custom" key="27835887"

//** Green book reference: p197-207 **//
 * Resources**

These video tutorials from [|Click4Biology]address each learning outcome. It's recommended that you use them both as part of your learning and your revision. Download links are provided for those who have trouble accessing Youtube. //N.B. The numbering of some of the videos is out due to Edexel syllabus changes.//

3.17a dominant, recessive, and phenotype [|download] media type="custom" key="27835895" 3.17b homozygous, heterozygous, and genotype [|download] media type="custom" key="27835899" 3.17c codominance [|download] media type="custom" key="27835901" 3.18 describe patterns of monohybrid inheritance using a genetic diagram //P1 x P1 Cross// [|download] media type="custom" key="27835905" //F1 x F1 Cross// [|download] media type="custom" key="27835907" 3.19 understand how to interpret family pedigrees //how to read pedigree diagrams// [|download] media type="custom" key="27835909" //dominant or recessive// [|download] media type="custom" key="27835915" 3.20 predict probabilities of outcomes from monohybrid crosses pt1 [|download] media type="custom" key="27835917" pt2 [|download] media type="custom" key="27835921" 3.21 sex determination [|download] media type="custom" key="27835923" 3.22 sex determination and probability [|download] media type="custom" key="27835925"