In mice (Mus musculus), sex determination is governed by the inheritance of sex chromosomes in a manner identical to humans.
Complete the Punnett square representation below by identifying the sex chromosome combinations for the gametes and the offspring.
Female Gamete 1Female Gamete 2Male Gamete 1Offspring AOffspring BMale Gamete 2Offspring COffspring D \begin{array}{c|cc} & \text{Female Gamete 1} & \text{Female Gamete 2} \\ \hline \text{Male Gamete 1} & \text{Offspring A} & \text{Offspring B} \\ \text{Male Gamete 2} & \text{Offspring C} & \text{Offspring D} \end{array} Male Gamete 1Male Gamete 2Female Gamete 1Offspring AOffspring CFemale Gamete 2Offspring BOffspring DIdentify:
The genotypes of the female gametes and male gametes.
The genotypes of offspring A, B, C, and D.
A pregnant female mouse gives birth to a litter of 121212 pups. Explain why there might be 888 female and 444 male pups, rather than exactly 666 of each.
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.