A hairy stemmed pea plant was crossed with a smooth stemmed pea plant and all of the F1 had hairy stems. The genotype of the hairy stemmed parent plant is?
Understand the Problem
The question describes a cross between a hairy-stemmed pea plant and a smooth-stemmed pea plant. All of the offspring (F1 generation) have hairy stems. We need to determine the genotype of the hairy-stemmed parent plant based on this information.
Answer
D homozygous dominant.
The genotype of the hairy stemmed parent plant is homozygous dominant. Therefore, the answer is D.
Answer for screen readers
The genotype of the hairy stemmed parent plant is homozygous dominant. Therefore, the answer is D.
More Information
If all the F1 generation offspring have hairy stems, and one parent has smooth stems, the hairy stem parent must be homozygous dominant (possessing two dominant alleles).
Tips
A common mistake is confusing heterozygous dominant with homozygous dominant. Remember that in this case, all offspring show the dominant trait, indicating both alleles from the hairy parent must be dominant.
Sources
- MCQ 3_5B Hwrk | National 5 Unit 3 Homework - Glow Blogs - blogs.glowscotland.org.uk
AI-generated content may contain errors. Please verify critical information
