## Related questions with answers

The achoo syndrome (sneezing in response to bright light) and trembling chin (triggered by anxiety) are both dominant traits in humans. a. What is the probability that the first child of parents who are heterozygous for both the achoo gene and trembling chin will have achoo syndrome but lack the trembling chin? b. What is the probability that the first child will not have achoo syndrome or trembling chin?

Solution

Verified$\textbf{a}$

Achoo syndrome and trembling chin are dominant traits (A and B). The
offspring of heterozygous parents is:

$P$: $Aa\times Bb$

$F_{1}$:

$AABB$; $AABb$; $AaBB$; $AaBb$;

$AABb$; ${AAbb}$; $AaBb$; ${Aabb}$;

$AaBB$; $AaBb$; $aaBB$; $aaBb$;

$AaBb$; ${Aabb}$; $aaBb$; ${aabb}$.

The genotype of a child with achoo syndrom but without trembling chin is
$Aabb$ or $AAbb$ (marked with red). The probability to have this child
is 3/16.

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