18. The inherited factors that are transmitted in an organism from generation to generation are called its.

Answer: B

Explanation:

The inherited factors that are transmitted in an organism from generation to generation are called its genotype.

Genotype refers to the genetic constitution of an organism, encompassing all inherited factors that determine traits passed down from one generation to the next.

A) heterozygote

A heterozygote is an organism that has two different alleles for a particular gene. While it relates to genetic variation, it does not refer to the complete set of inherited traits but rather the specific condition of having different alleles.

B) genotype

Genotype is the correct answer as it specifically refers to the complete collection of genetic information inherited from parents. It encompasses all the alleles an organism possesses, which contribute to its traits.

C) phenotype

Phenotype describes the observable characteristics or traits of an organism, which result from the interaction of genotype with the environment. It does not represent the inherited factors themselves, but rather how those factors are expressed.

D) homozygote

A homozygote is an organism with two identical alleles for a particular gene. Similar to heterozygotes, it refers to a specific genetic condition rather than the overall inherited factors that define an organism.

Conclusion

The genotype is definitively the correct answer as it encompasses all inherited genetic factors transmitted across generations. In contrast, the other options focus on specific genetic conditions or observable traits, rather than the complete genetic makeup that defines inheritance.