This clear and concise lesson explains how the inheritance of two or more genes that have loci on the same autosome demonstrates autosomal linkage. The engaging PowerPoint and associated resource have been designed to cover the part of point 6.1.2 (b[ii]) of the OCR A-level Biology A specification which states that students should be able to demonstrate and apply their knowledge and understanding of the use of phenotypic ratios to identify autosomal linkage.
This is a topic which can cause confusion for students so time was taken in the design to split the concept into small chunks. There is a clear focus on how the number of original phenotypes and recombinants can be used to determine linkage and suggest how the loci of the two genes compare. Important links to other topics such as crossing over in meiosis are made to enable students to understand how the random formation of the chiasma determines whether new phenotypes will be seen in the offspring or not. Linkage is an important cause of variation and the difference between observed and expected results and this is emphasised on a number of occasions. The main task of the lesson acts as an understanding check where students are challenged to analyse a set of results involving the inheritance of the ABO blood group gene and the nail-patella syndrome gene to determine whether they have loci on the same chromosome and if so, how close their loci would appear to be.
This lesson has been written to tie in with the other lessons from module 6.1.2 (Patterns of Inheritance)
Get this resource as part of a bundle and save up to 50%
A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.
Bundle
Module 6.1.2: Patterns of inheritance (OCR A-Level Biology A)
Each of the 13 lessons included in this bundle are fully-resourced and have been designed to cover the content as detailed in module 6.1.2 (Patterns of inheritance) of the OCR A-Level Biology A specification. The specification points that are covered within these lessons include: * The contribution of environmental and genetic factors to phenotypic variation * How sexual reproduction can lead to genetic variation within a species * Genetic diagrams to show patterns of inheritance * The use of phenotypic ratios to identify autosomal and sex linkage and epistasis * Using the chi-squared test * The factors that can affect the evolution of a species * The use of the Hardy-Weinberg principle to calculate allele frequencies * The role of isolating mechanisms in the evolution of a new species The lessons have been written to include a wide range of activities and numerous understanding and prior knowledge checks so students can assess their progress against the current topic as well as be challenged to make links to other topics within this module and earlier modules.
£14.00
Bundle
Genetic diagrams and phenotypic ratios (OCR A-level Biology A module 6.1.2 [b])
Each of the 6 lessons within this bundle are fully-resourced and cover the content of point (b) of module 6.1.2 of the OCR A-level Biology A specification which states that students should be able to use genetic diagrams and phenotypic ratios to show patterns of inheritance and explain linkage and epistasis. Students are guided through the construction of the genetic diagrams for the inheritance of one or two genes and are shown how to analyse the phenotypic ratio to determine whether linkage has occurred or whether a gene interaction is involved. The wide range of activities which includes exam questions with visual mark schemes, differentiated tasks and quiz competitions will maintain engagement whilst providing the students with opportunities to assess their progress against the current topic.
£6.00
Something went wrong, please try again later.
Great resource. Well thought out. Thank you for sharing.
Really helpful - wish it had a matching work sheet!
Great resource and appropriately priced too. A great explanation of autosomal linkage with fantastic visuals and problems to help. A bonus that answers are included too. A brilliant timesaving resource! Thanks :-)
Report this resourceto let us know if it violates our terms and conditions.
Our customer service team will review your report and will be in touch.
£3.00