Can YOU curl your tongue up on the sides? We are pretending that tongue-curling in humans is a dominant genetic trait. Suppose a man who is Tt for tongue-curling marries a woman who is also Tt for this trait. What are the possible genotypes and phenotypes of their children, and the percent chance for each? Genotype Phenotype (curl or no curl) Percent Chance (number only) TT Tt tt Blank 1: Blank 2: Blank 3: Blank 4: Blank 5: Blank 6:

Answer 1

To solve the genetics problem regarding the tongue-curling trait, we can use a Punnett square based on the genotypes of the parents. Since tongue-curling (T) is considered a dominant trait, and non-tongue-curling (t) is recessive, we can set up the Punnett square as follows:

Parent Genotypes:

• Father: Tt
• Mother: Tt

Possible Gametes:

• Father can produce gametes: T or t
• Mother can produce gametes: T or t

Punnett Square:

        T   |   t
      -------------
   T |  TT  |  Tt  
      -------------
   t |  Tt  |  tt  

Possible Genotypes and Phenotypes of Children:

1. TT: Homozygous dominant - can curl tongue (Curl)
2. Tt: Heterozygous - can curl tongue (Curl)
3. tt: Homozygous recessive - cannot curl tongue (No Curl)

Summary of Results:

• Genotype TT: 1 out of 4 (25%) - Curl
• Genotype Tt: 2 out of 4 (50%) - Curl
• Genotype tt: 1 out of 4 (25%) - No Curl

Compilation of the Answer:

• Genotype TT: Curl - 25%
• Genotype Tt: Curl - 50%
• Genotype tt: No Curl - 25%

Filling in the Blanks:

• Blank 1: TT
• Blank 2: Curl
• Blank 3: 25
• Blank 4: Tt
• Blank 5: Curl
• Blank 6: 50
• Blank 7: tt
• Blank 8: No Curl
• Blank 9: 25

Your final answer for the blanks would look like this:

• Blank 1: TT
• Blank 2: Curl
• Blank 3: 25
• Blank 4: Tt
• Blank 5: Curl
• Blank 6: 50
• Blank 7: tt
• Blank 8: No Curl
• Blank 9: 25