In a pea plant tallness is dominant over dwarfness .i) Explain a cross btw 2 heterozygous tall and plant using appropriate genetic symbol and plant using appropriate genetic symbol and diagram
Biology
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7 stepsLet's explain the cross between two heterozygous tall pea plants.
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Genetic Symbols:
- Let T represent the allele for tallness (dominant).
- Let t represent the allele for dwarfness (recessive).
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Parental Genotypes: Both parents are heterozygous tall, so their genotype is Tt.
Parental Cross (P generation)
Parents: Tt (Tall) × Tt (Tall)
Gametes produced by each parent
Each parent (Tt) can produce two types of gametes: T and t.
Punnett Square Diagram
We use a Punnett square to show the possible combinations of alleles in the offspring (F1 generation).
T t T TT Tt t Tt tt Genotypes of the F1 generation
From the Punnett square, the possible genotypes are:
- TT
- Tt
- tt
Genotypic Ratio
The ratio of genotypes is:
- 1 TT : 2 Tt : 1 tt (1 homozygous tall : 2 heterozygous tall : 1 homozygous dwarf)
Phenotypes of the F1 generation
Based on the genotypes:
- TT will be Tall
- Tt will be Tall (because T is dominant over t)
- tt will be Dwarf
Phenotypic Ratio
The ratio of phenotypes is:
- 3 Tall : 1 Dwarf
This means that for every four offspring, on average, three will be tall and one will be dwarf.
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