Question

the punnett square shows a text cross of mice that are heterozygous for both traits. what will their offspring be? fill in the white boxes of the punnett square with all possible offspring genotypes. a male mouse that is heterozygous for both genes (bbee) a female mouse that is heterozygous for both genes (bbee)

Explanation:

Step 1: Understand Allele Combination

For a Punnett square, each cell’s genotype is the combination of the row allele (from the female’s gamete) and the column allele (from the male’s gamete). For example, if the row is \( BE \) (female) and the column is \( Be \) (male), combine \( B \) with \( B \), \( E \) with \( e \) → \( BBEe \).

Step 2: Fill Each Row

• Row: BE (female gamete \( BE \)):
• Column \( BE \): \( B \times B \), \( E \times E \) → \( BBEE \) (given).
• Column \( Be \): \( B \times B \), \( E \times e \) → \( BBEe \).
• Column \( bE \): \( B \times b \), \( E \times E \) → \( BbEE \).
• Column \( be \): \( B \times b \), \( E \times e \) → \( BbEe \).

• Row: Be (female gamete \( Be \)):
• Column \( BE \): \( B \times B \), \( e \times E \) → \( BBEe \).
• Column \( Be \): \( B \times B \), \( e \times e \) → \( BBee \) (given).
• Column \( bE \): \( B \times b \), \( e \times E \) → \( BbEe \).
• Column \( be \): \( B \times b \), \( e \times e \) → \( Bbee \).

• Row: bE (female gamete \( bE \)):
• Column \( BE \): \( b \times B \), \( E \times E \) → \( BbEE \).
• Column \( Be \): \( b \times B \), \( E \times e \) → \( BbEe \).
• Column \( bE \): \( b \times b \), \( E \times E \) → \( bbEE \) (given).
• Column \( be \): \( b \times b \), \( E \times e \) → \( bbEe \).

• Row: be (female gamete \( be \)):
• Column \( BE \): \( b \times B \), \( e \times E \) → \( BbEe \).
• Column \( Be \): \( b \times B \), \( e \times e \) → \( Bbee \).
• Column \( bE \): \( b \times b \), \( e \times E \) → \( bbEe \).
• Column \( be \): \( b \times b \), \( e \times e \) → \( bbee \) (given).

Step 3: Verify Consistency

Check that all combinations follow Mendelian genetics (independent assortment of alleles). Each cell’s genotype is a valid combination of the two gametes, ensuring all possible allele pairings are accounted for.

Answer:

To fill the Punnett square, we combine the alleles from the row (female) and column (male) for each cell:

Row: BE (female)

• Column: Be (male): \( BE \times Be = BBEe \)
• Column: bE (male): \( BE \times bE = BbEE \)
• Column: be (male): \( BE \times be = BbEe \)

Row: Be (female)

• Column: BE (male): \( Be \times BE = BBEe \)
• Column: bE (male): \( Be \times bE = BbEe \)
• Column: be (male): \( Be \times be = Bbee \)

Row: bE (female)

• Column: BE (male): \( bE \times BE = BbEE \)
• Column: Be (male): \( bE \times Be = BbEe \)
• Column: be (male): \( bE \times be = bbEe \)

Row: be (female)

• Column: BE (male): \( be \times BE = BbEe \)
• Column: Be (male): \( be \times Be = Bbee \)
• Column: bE (male): \( be \times bE = bbEe \)

Filled Punnett square (row × column):

Punnett Square	BE	Be	bE	be
Be	BBEe	BBee	BbEe	Bbee
bE	BbEE	BbEe	bbEE	bbEe
be	BbEe	Bbee	bbEe	bbee