US is a highly developed country and it has expansive infrastructure and highly mechanized agricultural equipments. So first option is not a choice. Second, access to chemical fertilizers and pesticides in a country with such advanced agriculture infrastructure is very easy. Third US is well known for using GM crops.

US does not have a controlled population growth because if not the birth rate then migration of people to US is a major concern for that country. Thus, this will be a correct choice for the given question.

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Assume a phenotype is determined by one gene with a dominant allele and a recessive allele. If one parent is homozygous recessiv

d1i1m1o1n [39]

<h2>Phenotype probability</h2>

Explanation:

In the given question,let say A is dominant allele and a is recessive allele
Homozygous recessive parent(having both alleles recessive) will be denoted by aa genotype whereas heterozygous parent(one allele is dominant while other is recessive) will be denoted by Aa
When a cross is made between both the parents then the probability of offspring having the recessive phenotype will be 1/2 or we can say 50%