Biology Heredity Quiz past HSC questions Welcome to your Biology Heredity Quiz past HSC questions, 5 randomly generated questions relevant to module 5 heredity module from past HSC exams have been chosen. Aim to answer these in roughly 10 minutes. 1. Analysis of DNA shows that adenine and guanine always make up 50% of the total amount of nitrogenous bases in DNA. Which structural feature of DNA does this provide evidence for? DNA is helical in structure DNA is always a double-stranded molecule DNA always has adenine paired with guanine DNA is made up of equal amounts of nitrogenous bases. 2. The graph shows the levels of three hormones, oestrogen, progesterone and human chorionic gonadotrophin (HCG), measured in the blood of a woman during her pregnancy. Birth occurred about week 36. Fertilisation occurred at day 0. Implantation occurred about week 4. The placenta was formed about week 24. 3. A normal allele results in liver cells with sufficient cholesterol receptors. A different allele results in liver cells without cholesterol receptors. Individuals who are heterozygous have liver cells with insufficient cholesterol receptors. Sex-linked Autosomal dominant Autosomal recessive Incomplete dominance 4. Cystic fibrosis is an autosomal recessive disorder caused by mutations in the CFTR gene. Many different recessive alleles cause cystic fibrosis a1/a1 a1/a2 A/a1 A/A 5. The following four events occur during reproduction in a placental mammal. 1. Fertilisation2. Implantation3. Ovulation4. Placental formationIn which order do these events occur? 2, 1, 3, 4 2, 4, 1, 3 3, 1, 2, 4 3, 2, 4, 1 Time is Up! Time's up Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)
