In squash plants, the allele for white fruit colour (WWW) is dominant over the allele for yellow fruit colour (www).
A grower crossed a homozygous white-fruited plant (genotype WWWWWW) with a homozygous yellow-fruited plant. All resulting F1F_1F1 offspring had white fruit.
State the genotype of the homozygous yellow-fruited parent plant.
Two of the F1F_1F1 offspring plants (both with genotype WwWwWw) are crossed. Complete the genetic diagram (Punnett square) below by determining the missing genotypes of the offspring.
Male gamete: WMale gamete: wFemale gamete: WWW(i)Female gamete: w(ii)(iii) \begin{array}{c|c|c} & \text{Male gamete: } W & \text{Male gamete: } w \\\hline \text{Female gamete: } W & WW & \text{(i)} \\\hline \text{Female gamete: } w & \text{(ii)} & \text{(iii)} \end{array} Female gamete: WFemale gamete: wMale gamete: WWW(ii)Male gamete: w(i)(iii)Identify the genotypes for (i), (ii), and (iii).
State the expected ratio of white-fruited plants to yellow-fruited plants in the offspring of this cross in its simplest form.
76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.