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题目

解题步骤

1. Understand the question
   1. a dominant gene for handedness is represented by r (right handed) and a recessive gene for handedness is represented by r (left handed). fill in the following table.

   genotype\trr\t\t
   phenotype\t\t\tleft-handed
   name of allele combination\t\theterozygous\t

2. Explanation

   Step1: Fill RR phenotype

   Since R is dominant (right-handed), RR shows dominant trait.
   Phenotype for RR: Right-handed

   Step2: Fill heterozygous genotype

   Heterozygous = 1 dominant +1 recessive allele.
   Genotype: Rr

   Step3: Fill Rr phenotype

   Dominant R masks recessive r, so phenotype is right-handed.
   Phenotype for Rr: Right-handed

   Step4: Fill left-handed genotype

   Recessive trait needs 2 recessive alleles.
   Genotype: rr

   Step5: Fill RR allele combination

   Two identical dominant alleles = homozygous dominant.
   Allele combination for RR: Homozygous dominant

   Step6: Fill rr allele combination

   Two identical recessive alleles = homozygous recessive.
   Allele combination for rr: Homozygous recessive

3. Final answer

   | Genotype | RR | Rr | rr |
   |------------------------|-----|-----|-----|
   | Phenotype | Right-handed | Right-handed | Left-handed |
   | Name of Allele Combination | Homozygous dominant | Heterozygous | Homozygous recessive |

答案

Question Analysis

OCR Text

10. a dominant gene for handedness is represented by r (right handed) and a recessive gene for handedness is represented by r (left handed). fill in the following table.
genotype\trr\t\t
phenotype\t\t\tleft-handed
name of allele combination\t\theterozygous\t

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