Question

1. the different forms of a gene.

gene
chromosome
trait
alleles

Explanation:

The question is about the different forms of a gene. In genetics (a subfield of Biology, which is part of Natural Science), alleles are defined as the different forms of a gene. Genes are the units of heredity, chromosomes are structures containing genes, and traits are the characteristics determined by genes/alleles. So the correct term for different forms of a gene is alleles. Wait, but let's re - check: Wait, no, wait. Wait, the options: Wait, the options are "gene", "chromosome", "trait", "alleles". Wait, the definition: Alleles are alternative forms of a gene. So the correct answer should be alleles. Wait, but in the image, the selected option is "trait" which is incorrect. Let's correct it. The different forms of a gene are called alleles. Let's analyze each option:

• Gene: A gene is a segment of DNA that codes for a specific trait, not the different forms of a gene.
• Chromosome: A chromosome is a structure that contains many genes, it's not the different forms of a gene.
• Trait: A trait is a characteristic of an organism (like eye color), it's determined by genes/alleles, not the different forms of a gene.
• Alleles: By definition, alleles are the different forms of a gene.

Answer:

alleles (the option corresponding to "alleles" among the given options, likely the last unselected circle with "alleles" text)