3.4 - Inheritance
Assessment statements
| DCS Topic Code | Statement | Guidance |
| 3.4.U1 | Mendel discovered the principles of inheritance with experiments in which large numbers of pea plants were crossed. | |
| 3.4.U2 | Gametes are haploid so contain only one allele of each gene. | |
| 3.4.U3 | The two alleles of each gene separate into different haploid daughter nuclei during meiosis. | |
| 3.4.U4 | Fusion of gametes results in diploid zygotes with two alleles of each gene that may be the same allele or different alleles. | |
| 3.4.U5 | Dominant alleles mask the effects of recessive alleles but co-dominant alleles have joint effects. | |
| 3.4.U6 | Many genetic diseases in humans are due to recessive alleles of autosomal genes, although some genetic diseases are due to dominant or co-dominant alleles. | |
| 3.4.U7 | Some genetic diseases are sex-linked. The pattern of inheritance is different with sex-linked genes due to their location on sex chromosomes. | Alleles carried on X chromosomes should be shown as superscript letters on an upper case X, such as Xh. |
| 3.4.U8 | Many genetic diseases have been identified in humans but most are very rare. | |
| 3.4.U9 | Radiation and mutagenic chemicals increase the mutation rate and can cause genetic diseases and cancer. | |
| 3.4.A1 | Inheritance of ABO blood groups. | The expected notation for ABO blood group alleles: O = i, A=IA, B = IB. |
| 3.4.A2 | Red-green colour blindness and hemophilia as examples of sex-linked inheritance. | |
| 3.4.A3 | Inheritance of cystic fibrosis and Huntington’s disease. | |
| 3.4.A4 | Consequences of radiation after nuclear bombing of Hiroshima and accident at Chernobyl. | |
| 3.4.S1 | Construction of Punnett grids for predicting the outcomes of monohybrid genetic crosses. | |
| 3.4.S2 | Comparison of predicted and actual outcomes of genetic crosses using real data. | |
| 3.4.S3 | Analysis of pedigree charts to deduce the pattern of inheritance of genetic diseases. |
Notes
| 3.4_notes.pdf |
PlayPosits
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Review PowerPoint
| 3.4_inheritance.ppt |
