Is TT a heterozgous in genetics

No

Explanation:

The heterozygous genotype (Rr) has the dominant round seed shape as its recessive allele (r) is masked in the phenotype. Incomplete dominance: One of the heterozygous alleles does not completely mask the other. Instead, a different phenotype is seen that is a combination of the phenotypes of the two alleles.

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i think it is true in my reasonment ..

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.