Question

if spongebob squarepants and spongesusie roundpants produce a baby sponge, what will be the probability that their offspring sponge will be square shaped if spongebob is heterozygous dominant (ss) for his square shape and sponge susie is homozygous recessive (ss) for her round shape? complete this punnett square that has been started for you and then choose the correct response. spongebob image and punnett square image omitted

Explanation:

Step1: Complete Punnett Square

SpongeBob's gametes: S, s; SpongeSusie's gametes: s, s. The last cell (bottom - right) is formed by combining SpongeBob's s (top) and SpongeSusie's s (left), so it's \( ss \). Now the Punnett Square has cells: \( Ss \), \( ss \), \( Ss \), \( ss \).

Step2: Identify Square - Shaped Genotypes

Square shape is dominant, so genotypes with S (Ss) show square shape. Count Ss cells: 2 (first row first, second row first) and ss cells: 2 (first row second, second row second). Wait, no, after completing, the Punnett Square rows are SpongeSusie's gametes (both s), columns are SpongeBob's gametes (S and s). So the four cells: (s from Susie, S from Bob) = Ss; (s from Susie, s from Bob) = ss; (s from Susie, S from Bob) = Ss; (s from Susie, s from Bob) = ss. So Ss (square) count: 2, ss (round) count: 2.

Step3: Calculate Probability

Probability = (Number of square - shaped offspring) / (Total number of offspring). Total cells = 4, square - shaped (Ss) = 2. So probability = \( \frac{2}{4}=\frac{1}{2} \) or 50%.

Answer:

The probability that their offspring sponge will be square - shaped is \( \frac{1}{2} \) (or 50%).