Dogs!

The A locus controls ear shape with A being dominant for round ears, where $a$ is the recessive allele for pointy ears.

The $B$ locus controls tail shape with $B$ being dominant for puffy tail, where $b$ is the recessive allele for spiked tail.

Two parents, a round ear puffy tail dog $($AABB$)$ and a pointy ear spiked tail dog $($aabb$)$ were crossed. The the F$1$ were used in a testcross of AaBb $x$ aabb which resulted in the following progeny:

$134$ round ear, puffy tail $89$ round ear, spiked tail $91$ pointy ear, puffy tail $129$ pointy ear, spiked tail

Test the null hypothesis $(H_0)$ that ear shape and tail shape are unlinked.

Multiple Choice $1$ point

What is the phenotypic $($and genotypic$)$ ratio expected for this testcross?

$1$:$1$:$1$:$1$

$3$:$1$

$9$:$3$:$3$:$1$

$1$:$2$:$1$

Multiple Choice $1$ point

What is the chi square value for this cross? $($NOTE: use rounding up $(>0\mathrm{.}5)$ and down $(<mn>0</mn><mn>.</mn><mn>5</mn><mtext></mtext><mi>)</mi>$ rules if you get a fraction of a puppy in your expected values$)$

$3\mathrm{.}6$

$2\mathrm{.}9$

$4\mathrm{.}4$

$15\mathrm{.}7$

$4\mathrm{.}8$

Multiple Choice $1$ point

What are the df and pvalue of this cross?

$df=2,$ pvalue $=>0\mathrm{.}05$

$df=3,$ pvalue $=>0\mathrm{.}05$

$df=3,$ pvalue $=<mn>0</mn><mn>.</mn><mn>0</mn><mn>5</mn>$

$df=2,$ pvalue $=<mn>0</mn><mn>.</mn><mn>0</mn><mn>5</mn>$

Multiple Choice $1$ point

Are the A and $B$ loci linked?

No

Yes

$40$

Multiple Choice $1$ point

What is the genetic distance between the A and B loci $($genes$)?$

$10$ cm

$41$ cM

$50$ cm

$34$ cM

$41$

Multiple Choice

$2$ points