Question

question: how do scientists predict the genotypes of offspring?

1. model: scientists use a punnett square to model the different possible offspring genotypes from a parent pair. the parent genotypes are written across the top and side of the square, as shown. the four possible offspring genotypes are then filled in.

the first square is filled in for you. fill in the remaining squares.

Explanation:

Step1: Analyze the Punnett Square Structure

The Punnett square has parent genotypes: top row is \( F \) and \( F \), side column is \( f \) and \( f \). To fill the squares, we use the principle of combining the alleles from the top (parent 1) and side (parent 2).

Step2: Fill the Second Square in the First Row

For the top - right square, we combine the \( F \) from the top (first parent) and \( f \) from the side (second parent). So the genotype here is \( Ff \).

Step3: Fill the First Square in the Second Row

For the bottom - left square, we combine the \( f \) from the top (first parent) and \( f \) from the side (second parent)? Wait, no, wait. Wait, the side column is \( f \) (first row of side) and \( f \) (second row of side). The top row is \( F \) (first column of top) and \( F \) (second column of top). Wait, the first square (top - left) is \( Ff \) (given). Now, the top - right square: top allele \( F \), side allele \( f \), so \( Ff \). The bottom - left square: top allele \( F \)? No, wait, no. Wait, the top row is the alleles from one parent (let's say parent 1: gametes \( F \) and \( F \)), and the side column is the alleles from parent 2: gametes \( f \) and \( f \). So the Punnett square is:

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

Wait, let's correct. Parent 1 (top) has gametes \( F \) and \( F \) (so two \( F \) alleles, maybe homozygous dominant? Wait, no, the top row is two columns, so parent 1's gametes are \( F \) (first column) and \( F \) (second column). Parent 2 (side) has gametes \( f \) (first row) and \( f \) (second row). So when we cross \( F \) (parent 1) with \( f \) (parent 2) for the first square (top - left), we get \( Ff \). For the top - right square: \( F \) (parent 1) and \( f \) (parent 2), so \( Ff \). For the bottom - left square: \( F \) (parent 1) and \( f \) (parent 2), so \( Ff \). For the bottom - right square: \( F \) (parent 1) and \( f \) (parent 2), so \( Ff \). Wait, maybe the parent 1 is \( Ff \) and parent 2 is \( Ff \)? No, the top row is \( F \) and \( F \), side is \( f \) and \( f \). Wait, the given first square is \( Ff \), so let's re - evaluate.

Wait, the top row of the Punnett square is labeled \( F \) and \( F \) (two columns), and the side column is labeled \( f \) and \( f \) (two rows). So the four cells:

• Top - left: \( F \) (top) and \( f \) (side) → \( Ff \) (given)
• Top - right: \( F \) (top) and \( f \) (side) → \( Ff \)
• Bottom - left: \( F \) (top) and \( f \) (side) → \( Ff \)
• Bottom - right: \( F \) (top) and \( f \) (side) → \( Ff \)

Wait, maybe the parent 1 is \( Ff \) (so gametes \( F \) and \( f \)) and parent 2 is \( Ff \) (gametes \( F \) and \( f \))? But the top row is \( F \) and \( F \), side is \( f \) and \( f \). No, the labels on the top are \( F \) and \( F \), side are \( f \) and \( f \). So parent 1 is homozygous dominant (\( FF \)) and parent 2 is homozygous recessive (\( ff \)). Then all offspring will be \( Ff \). So the remaining squares:

Top - right: \( F \) (from top) and \( f \) (from side) → \( Ff \)

Bottom - left: \( F \) (from top) and \( f \) (from side) → \( Ff \)

Bottom - right: \( F \) (from top) and \( f \) (from side) → \( Ff \)

Answer:

The filled - in Punnett square is:

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

(So the remaining squares: top - right is \( Ff \), bottom - left is \( Ff \), bottom - right is \( Ff \))