10. Two rough black guinea pigs when bred together have two offspring. One of them is rough white and the other is smooth black. What are the genotypes of these parents? Parent 1 Parent 2

22. What will be the phenotype of the fly that grows from the fertilized cell shown below? (LS3-1) * Allele key Dominant Recessive C- Curly wing B - Brown body L- Legs on head R- Red eyes C - normal wing b - black body 1- antenna r- orange eyes Normal wings, black body, antenna, and red eyes. Curly wings, brown body, legs on head, and red eyes. Curly wings, brown body, legs on head, and orange eyes. O Normal wings, brown body, legs on head, and red eyes

2. In corn the genes for tassel length (alleles T and t) and rust resistance (alleles R and r) are known to be on separate chromosomes. In the course of a routine mating check experiment, a breeder got the following results upon crossing T/t:R/r with a double recessive strain (t/t/r): Number of progeny genotype T/t; R/r t/t; r/r T/t; r/r t/t; R/r In addition to these data she noted that the cobs contain only about 50% of the expected kernels. Note that in corn, each kernel is the result of one mating or can be considered one progeny. Hence 50% of the matings are not producing viable offspring. a. Based on the location of these genes on separate chromosomes what is the 98 104 3 5 expected result? b. Suggest a hypothesis of a genetic process that could be used to explain the potential karyotype of one of these parents. c. What are the actual genotypes of the parents? d. Draw a diagram (hand drawn diagrams are fine just scan the image and insert it into your exam as picture) showing the…

4. A different population of lemmings have a third allele (i.e. a third version of the same gene) for hair colour, the blue allele. a) When pure-breeding red-haired lemmings were crossed with pure-breeding blue haired lemmings, the offspring all had purple hair. Using appropriate genetic diagrams, explain the above result. b) Predict the offspring and their ratios if the purple-haired lemmings were crossed with one another.