A middle school student is studying genetics in their science class. They are using punnett squares to determine the probability that a trait will be passed on from one generation to the next. The student creates a punnett square for eye color using the genotypes of their parents. A big B represents the gene for brown eyes, and a little b represents the gene for blue eyes. Select the statement(s) that accurately describe the outcomes of the punnett square. The allele for brown eyes is dominant to the allele for blue eyes. In order to have blue eyes, the student would have to inherit the alleles for blue eyes from both parents. The student had a 75 percent chance of inheriting blue eyes. The student had a 50 percent chance of inheriting brown or blue eyes. In order to have brown eyes, the student would need to inherit the alleles for brown eyes from both parents.

Question

A middle school student is studying genetics in their science class. They are using punnett squares to determine the probability that a trait will be passed on from one generation to the next. The student creates a punnett square for eye color using the genotypes of their parents. A big B represents the gene for brown eyes, and a little b represents the gene for blue eyes. Select the statement(s) that accurately describe the outcomes of the punnett square. The allele for brown eyes is dominant to the allele for blue eyes. In order to have blue eyes, the student would have to inherit the alleles for blue eyes from both parents. The student had a 75 percent chance of inheriting blue eyes. The student had a 50 percent chance of inheriting brown or blue eyes. In order to have brown eyes, the student would need to inherit the alleles for brown eyes from both parents.

Answer 1

Statements 1 and 2 are correct.

Answer 2

## Step 1The problem revolves around the concept of single gene inheritance in Genetics, particularly the probabilistic representation through Punnett square. The gene for brown eyes is denoted by B and blue eyes by b. In the question, "B" (big/uppercase) represents the dominant allele (as is conventional) for brown eyes, while "b" (small/lowercase) is the recessive allele for blue eyes.## Step 2### **Dominance Principle**In genetics, the dominant allele is represented by an uppercase letter (B in this case), while the recessive allele is represented by a lowercase letter (b in this case). If an individual has both a dominant and a recessive allele (Bb), the dominant allele (B) will be expressed, resulting in brown eyes.## Step 3### **Recessive Principle**The recessive allele (b) will only be expressed if an individual has two copies of it (bb). This means that in order for a person to have blue eyes, they must inherit the allele for blue eyes from both parents.## Step 4The statements provided in the problem are analyzed based on the principles of genetics:1. The allele for brown eyes is dominant to the allele for blue eyes. - This statement is true, as per the dominance principle.2. In order to have blue eyes, the student would have to inherit the alleles for blue eyes from both parents. - This statement is also true, as per the recessive principle.3. The student had a 75 percent chance of inheriting blue eyes. - This statement cannot be confirmed without knowing the exact genotypes of the parents.4. The student had a 50 percent chance of inheriting brown or blue eyes. - This statement also cannot be confirmed without knowing the exact genotypes of the parents.5. In order to have brown eyes, the student would need to inherit the alleles for brown eyes from both parents. - This statement is not necessarily true. As per the dominance principle, even if a person has only one dominant allele (B), they will have brown eyes.

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