The best possible explanation for the difference in behaviour is trait expression. Recessive traits can only be expressed with recessive alleles.
What is recessive traits?
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 the 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
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