Question

multiple choice 5 points
in most dog breeds, one gene has a large effect on ear flop. floppy dog ears are a dominant genetic trait and straight pointy ears are recessive. a female dog that is heterozygous for floppy ears (ff) is bred with a male dog that is also heterozygous for floppy ears. what is the probability of the offspring having straight - pointy ears?
options: 1/4, 1/2, 2/4, 3/4

Explanation:

Step1: Determine the genotypes

Let \( F \) represent the dominant allele (floppy ears) and \( f \) represent the recessive allele (straight - pointy ears). The female dog is \( Ff \) (heterozygous for floppy ears), and the male dog is also \( Ff \) (heterozygous for floppy ears).

Step2: Set up the Punnett square

The possible gametes from each parent are \( F \) and \( f \). The Punnett square is:

	\( F \)	\( f \)
\( f \)	\( Ff \)	\( ff \)

Step3: Calculate the probability

The genotype \( ff \) (straight - pointy ears) occurs 1 out of 4 times. So the probability is \( \frac{1}{4} \).

Answer:

\(\frac{1}{4}\)