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A maize plant of genotype $$ \begin{array}{c} L_D \\ I_d \\ \\ \end{array} $$ was involved in a test cross - VCE - SSCE Biology - Question 5 - 2004 - Paper 1
Question 5
A maize plant of genotype $$ \begin{array}{c} L_D \\ I_d \\ \\ \end{array} $$ was involved in a test cross. The genotype of the plant to which it was crossed wou... show full transcript
Worked Solution & Example Answer:A maize plant of genotype $$ \begin{array}{c} L_D \\ I_d \\ \\ \end{array} $$ was involved in a test cross - VCE - SSCE Biology - Question 5 - 2004 - Paper 1
Step 1
The genotype of the plant to which it was crossed would be
Answer
In a test cross where one parent is homozygous recessive, to determine the genotype of the crossing partner, we consider the alleles of the maize plant in question, which is a dihybrid with genotypes L_D and I_d. The correct genotype of the plant to which it was crossed must contain both recessive alleles, thus it should be represented as:
This corresponds to option B.