Which statement is true about recessive traits? Recessive traits can only be expressed with recessive alleles.
Recessive traits can only be expressed with dominant alleles.
Recessive traits can be expressed with a combination of recessive and dominant alleles.
Recessive traits are never expressed.

Recessive traits can only be expressed with recessive alleles.

Explanation:

According to the law of dominance as proposed by Gregor Mendel, an allele of a gene is capable of masking the phenotypic expression of another allele in the same gene. This allele that masks or that is expressed is called DOMINANT allele while the allele being masked is the RECESSIVE allele.

The dominant allele is responsible for the dominant trait in the organism. Hence, the dominant trait will be expressed when the dominant allele and recessive allele combines (heterozygous). However, the recessive trait is only expressible when the recessive alleles are the same in the gene.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

nucleus

would be most reasonable answer tbh