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In German cockroaches, curved wings $(c v)$ are recessive to normal wings $\left(c v^{+}\right) .$ A homozygous cockroach having normal wings is crossed with a homo...

Question

In German cockroaches, curved wings $(c v)$ are recessive to normal wings $\left(c v^{+}\right) .$ A homozygous cockroach having normal wings is crossed with a homozygous cockroach having curved wings. The $\mathrm{F}_{1}$ are intercrossed to produce the $\mathrm{F}_{2}$. Assume that the pair of chromosomes containing the locus for wing shape is metacentric. Draw this pair of chromosomes as it would appear in the parents, the $\mathrm{F}_{1}$, and each class of $\mathrm{F}_{2}$ progeny at metaph

In German cockroaches, curved wings $(c v)$ are recessive to normal wings $\left(c v^{+}\right) .$ A homozygous cockroach having normal wings is crossed with a homozygous cockroach having curved wings. The $\mathrm{F}_{1}$ are intercrossed to produce the $\mathrm{F}_{2}$. Assume that the pair of chromosomes containing the locus for wing shape is metacentric. Draw this pair of chromosomes as it would appear in the parents, the $\mathrm{F}_{1}$, and each class of $\mathrm{F}_{2}$ progeny at metaphase I of meiosis. Assume that no crossing over takes place. At each stage, label a location for the alleles for wing shape $(c v$ and $\mathrm{cv}^{+}$ ) on the chromosomes.



Answers

Drosophila that are true breeding for the traits straight wings (S) and red eyes (R) are crossed with flies that are true breeding for curved wings (s) and brown eyes (r). A test cross is then made between the offspring and the truebreeding ssrr flies.
A. Use the symbols S, s, R, and r to construct a representation of the parental genotypes in the
test cross.
B. If these genes are located on different chromosomes, use a Punnett square to construct a representation of the offspring of the test cross.
C. Predict the distribution of genotypes and phenotypes resulting from the test cross.
D. As it happens, these genes are both on chromosome II as shown below. Use the symbols S, s, R, and r to construct a representation of the parental and recombinant genotypes in the test cross.
E. Suppose that 500 flies are produced in the test cross. Apply mathematical methods to calculate the expected number of recombinant offspring using the linear map units (LMU) shown in the diagram below.


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