Biology 9700 · AS & A Level · Passage of information from parents to offspring
Passage of information from parents to offspring — practice question
The fruit fly, Drosophila melanogaster, has eyes, a striped abdomen and wings that are longer than its abdomen; this phenotype is known as a wild-type fly. Mutation has produced many different forms of these features. Table 6.1 presents diagrams of a wild-type fly and three other flies, each displaying one recessive mutation.
(a)[4]
Using appropriate symbols, finish the genetic diagram below.
(b)[1]
State the method you would use to carry out a test cross.
(c)[3]
A cross was made between a fly heterozygous for striped abdomen and long wings and a fly with a black abdomen and short wings. The outcomes are shown in Table 6.2. A chi-squared test ($\chi^2$) was performed on the data. Complete Table 6.3 and work out the value of $\chi^2$.
(d)[2]
Table 6.4 lists $\chi^2$ values. Use Table 6.4 to explain what conclusions may be drawn from the $\chi^2$ test results.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme.