The leaf colour in a plant is controlled by two alleles, green (G) and yellow (g) - NSC Life Sciences - Question 2 - 2016 - Paper 2
Question 2
The leaf colour in a plant is controlled by two alleles, green (G) and yellow (g). Thorns on plant stems are controlled by two alleles, presence of thorns (T) and no... show full transcript
Worked Solution & Example Answer:The leaf colour in a plant is controlled by two alleles, green (G) and yellow (g) - NSC Life Sciences - Question 2 - 2016 - Paper 2
Step 1
Give the: (a) Genotype of (i)
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The genotype of (i) is GgTt, which results from the genetic combinations given in the gametes of the second generation, where one allele comes from each parent.
Step 2
Give the: (b) Phenotype of (ii)
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The phenotype of (ii) corresponds to yellow leaves and no thorns. This is expressed through the recessive traits, which are represented as ggtt.
Step 3
List the FOUR genotypes of the offspring of the second generation that would be phenotypically different from the original pair of parents.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The four genotypes that would be phenotypically different from the original pair of parents (GGTT and ggtt) are: GgTt, GGtt, GgTT, and ggTt. These combinations result in variations in leaf color and thorn presence.
