Module 5: Heredity

A focused answer to the HSC Biology Module 5 dot point on non-Mendelian inheritance. The difference between codominance and incomplete dominance, multiple alleles using ABO blood groups as the worked example, and the standard Punnett squares with worked HSC past exam questions.

A focused answer to the HSC Biology Module 5 dot point on Mendelian inheritance. Mendel's laws, dominant vs recessive alleles, Punnett squares step by step, monohybrid and dihybrid crosses, the standard 3:1 and 9:3:3:1 ratios, and worked HSC past exam questions.

A focused answer to the HSC Biology Module 5 dot point on sex-linked (X-linked) inheritance. Why X-linked recessive disorders affect males more than females, the standard worked Punnett squares for carrier mothers, named examples (haemophilia, colour blindness, Duchenne muscular dystrophy), the criss-cross pedigree pattern, and worked HSC past exam questions.

A focused answer to the HSC Biology Module 5 dot point on DNA replication. The semi-conservative model, the enzymes (helicase, primase, DNA polymerase, ligase), leading and lagging strands, how mitosis and meiosis differ, and how accurate replication maintains continuity of species, with worked HSC exam examples.

A focused answer to the HSC Biology Module 5 dot point on meiosis. The two divisions, crossing over and independent assortment as sources of genetic variation, comparison with mitosis, and how gamete formation maintains chromosome number across generations.

A focused HSC Biology Module 5 answer on technologies that reveal inheritance patterns in a population: DNA sequencing (Sanger chain-termination and next-generation) versus DNA profiling (PCR, short tandem repeats and gel electrophoresis), how to read a gel, and applications in forensics, paternity, conservation and disease-allele tracking.

A focused HSC Biology Module 5 answer on using large-scale collaborative data to find trends in population genetics: allele and genotype frequencies in a gene pool, why pooled data matters, and examples from the 1000 Genomes Project, conservation genetics, disease-allele tracking and human evolution.

A focused answer to the HSC Biology Module 5 dot point on DNA structure. The double helix, the sugar-phosphate backbone, the four bases and the A-T/G-C base pairing rules, the historical contributions of Watson, Crick, Franklin (Photograph 51) and Wilkins, the forms DNA takes in eukaryotes vs prokaryotes, and worked HSC past exam questions.

A focused answer to the HSC Biology Module 5 dot point on protein synthesis. Transcription in the nucleus (DNA to mRNA), translation at the ribosome (mRNA to polypeptide), the roles of mRNA, tRNA, rRNA, the codon-anticodon match, and the standard worked exam example.

A focused answer to the HSC Biology Module 5 dot point on mammalian reproduction. Fertilisation of the egg by sperm to form a zygote, cleavage and blastocyst implantation, the menstrual-cycle context (FSH, LH), hCG maintaining the corpus luteum, progesterone and oestrogen maintaining the endometrium and pregnancy, the placenta, and birth driven by oxytocin positive feedback.

A focused answer to the HSC Biology Module 5 dot point on how reproduction ensures species continuity. Asexual methods (binary fission, budding, vegetative propagation, spores), sexual reproduction across animals, plants, fungi, bacteria and protists, the advantages and disadvantages of each, and how variation versus genetic uniformity links to survival.

A focused HSC Biology Module 5 answer on manipulating reproduction in agriculture: artificial insemination and pollination, hormone-induced ovulation, multiple embryo transfer and superovulation, and cloning by somatic cell nuclear transfer, plus how to evaluate their benefits against costs like reduced genetic diversity.