D 3.2 Inheritance

Syllabus statements

D3.2.1 Production of haploid gametes in parents and their fusion to form a diploid zygote as the means of inheritance

D3.2.2 Methods for conducting genetic crosses in flowering plants

D3.2.3 Genotype as the combination of alleles inherited by an organism

D3.2.4 Phenotype as the observable traits of an organism resulting from genotype and environmental factors

D3.2.5 Effects of dominant and recessive alleles on phenotype

D3.2.6 Phenotypic plasticity as the capacity to develop traits suited to the environment experienced by an organism, by varying patterns of gene expression

D3.2.7 Phenylketonuria as an example of a human disease due to a recessive allele

D3.2.8 Single-nucleotide polymorphisms and multiple alleles in gene pools

D3.2.9 ABO blood groups as an example of multiple alleles

D3.2.10 Incomplete dominance and codominance

D3.2.11 Sex determination in humans and inheritance of genes on sex chromosomes

D3.2.12 Haemophilia as an example of a sex-linked genetic disorder

D3.2.13 Pedigree charts to deduce patterns of inheritance of genetic disorders

D3.2.14 Continuous variation due to polygenic inheritance and/or environmental factors

D3.2.15 Box-and-whisker plots to represent data for a continuous variable such as student height

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D3.2.16 AHL Segregation and independent assortment of unlinked genes in meiosis

D3.2.17 AHL Punnett grids for predicting genotypic and phenotypic ratios in dihybrid crosses involving pairs of unlinked autosomal genes

D3.2.18 AHL Loci of human genes and their polypeptide products

D3.2.19 AHL Autosomal gene linkage

D3.2.20 AHL Recombinants in crosses involving two linked or unlinked genes

D3.2.21 AHL Use of a chi-squared test on data from dihybrid crosses