If a pure tall pea plant with round seeds (TTRR) is crossed with a pure dwarf pea plant with wrinkled seeds (ttrr), what

Question

If a pure tall pea plant with round seeds (TTRR) is crossed with a pure dwarf pea plant with wrinkled seeds (ttrr), what will be the phenotype of the F1 generation? Explain the reasoning behind your answer.

Accepted Answer

Step 1: Identify parental genotypes and phenotypes.
Parent 1 (Homozygous Tall, Homozygous Round Seeds) = TTRR
Parent 2 (Homozygous Dwarf, Homozygous Wrinkled Seeds) = ttrr 
Step 2: Determine gametes produced by each parent.
Parent TTRR produces gametes carrying: TR
Parent ttrr produces gametes carrying: tr 
Step 3: Combine gametes to form the F1 generation.
Fertilization of TR gametes with tr gametes results in offspring with the genotype: TrRr (or conventionally written as TrRr -> Let's use standard notation: TrRr is TtRr).
So, F1 genotype = TtRr. 
Step 4: Analyze the phenotype of the F1 generation. The allele 'T' is dominant over 't', so the plant is tall. The allele 'R' is dominant over 'r', so the seeds are round. 
Step 5: Final Conclusion.
Therefore, the phenotype of all individuals in the F1 generation will be Tall with Round seeds, because dominant alleles mask the expression of recessive alleles.

Heredity

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