Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type o blood, although the disease and blood group are independently inherited.
a normal man with type a blood and a normal woman with type b blood have already had one child with the disease. the woman is now pregnant for a second time.
assuming that both parents are heterozygous for the gene that causes the disease, what is the probability that the second child will also have the disease? express your answer as a fraction using the slash symbol and no spaces (for example, 1/2).

You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation