Question

in a group of cats, some individuals have straight fur and others have curly fur. in this group, the gene for the fur type trait has two alleles. the allele for curly fur (f) is recessive to the allele for straight fur (f). this punnett square shows a cross between two cats. punnett square with f and f as row and column headers, cells: ff, ff, ff, ff what is the expected ratio of heterozygous to homozygous recessive to homozygous dominant offspring genotypes? write the most likely ratio. three blank boxes for ratio submit

Explanation:

Step1: Identify Genotypes

First, we identify the genotypes from the Punnett square: \( FF \) (homozygous dominant), \( Ff \) (heterozygous), and \( ff \) (homozygous recessive).

Step2: Count Each Genotype

Count the number of each genotype: \( FF \): 1, \( Ff \): 2, \( ff \): 1. Wait, no, wait. Wait, the Punnett square has \( FF \): 1, \( Ff \): 2 (the two \( Ff \)s), and \( ff \): 1? Wait, no, let's re - check. The Punnett square cells are \( FF \), \( Ff \), \( Ff \), \( ff \). So \( FF \): 1, \( Ff \): 2, \( ff \): 1? Wait, no, the question is heterozygous (\( Ff \)) to homozygous recessive (\( ff \)) to homozygous dominant (\( FF \)). So heterozygous (\( Ff \)) count: 2, homozygous recessive (\( ff \)) count: 1, homozygous dominant (\( FF \)) count: 1? Wait, no, wait the Punnett square:

Top - left: \( FF \) (homozygous dominant)

Top - right: \( Ff \) (heterozygous)

Bottom - left: \( Ff \) (heterozygous)

Bottom - right: \( ff \) (homozygous recessive)

So \( FF \): 1, \( Ff \): 2, \( ff \): 1. But the ratio is heterozygous : homozygous recessive : homozygous dominant. So heterozygous is \( Ff \) (2), homozygous recessive is \( ff \) (1), homozygous dominant is \( FF \) (1). Wait, no, wait the order is heterozygous to homozygous recessive to homozygous dominant. So \( Ff \) (2) : \( ff \) (1) : \( FF \) (1). Wait, but let's check again. Wait, the Punnett square has four cells: \( FF \), \( Ff \), \( Ff \), \( ff \). So:

• Homozygous dominant (\( FF \)): 1
• Heterozygous (\( Ff \)): 2
• Homozygous recessive (\( ff \)): 1

So the ratio of heterozygous (\( Ff \)) to homozygous recessive (\( ff \)) to homozygous dominant (\( FF \)) is \( 2:1:1 \).

Answer:

\( 2:1:1 \)