(c) If 320 offspring are produced, how many are expected to have purple flowers and pointed leaves? Show your working. (2 marks)
In Arabidopsis thaliana , flower color is controlled by a single gene with two alleles: Purple (P) dominant over white (p). Another unlinked gene controls leaf shape: Round (R) dominant over pointed (r). singapore junior biology olympiad past papers
(b) Explain the concept of countercurrent exchange in fish gills and explain why it is more efficient than concurrent flow. (4 marks) (c) If 320 offspring are produced, how many
(a) List two structural adaptations of the alveolus that maximize gas exchange. (2 marks) Another unlinked gene controls leaf shape: Round (R)
(e) Describe one real-world application of Mendelian genetics in agriculture. (2 marks)
(d) Name the principle illustrated by the independent assortment of these two genes. (1 mark)
(c) The student forgot to include a control vial with glass beads (no crickets). Explain why a control is necessary. (2 marks)