A dominant allele is one that expresses its phenotype even when only one copy is present, meaning that if an individual has at least one dominant allele for a particular trait, that trait will be displayed in their phenotype. This contrasts with recessive alleles, which only manifest their effects when two copies (homozygous) are present. In summary, the accurate statement about dominant alleles is that they can mask the expression of recessive alleles in a heterozygous genotype.
which statement is accurate bout dominant alleles
3 answers
they are in lowercase letters,they result in the trait of shortness in pea plants, they are expressed only when a recessive allele is ot present they are expressed whenever present
It seems you are referring to some characteristics of alleles in the context of Mendelian genetics, particularly regarding traits in pea plants that were studied by Gregor Mendel. Let’s clarify the statements you provided:
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"They are in lowercase letters" - This typically refers to recessive alleles, not dominant alleles. Dominant alleles are often represented by uppercase letters (e.g., "T" for tall plants), while recessive alleles are represented by lowercase letters (e.g., "t" for short plants).
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"They result in the trait of shortness in pea plants" - This statement would describe a recessive allele (e.g., "t") for the trait of shortness. The dominant allele (e.g., "T") would result in the phenotype of tallness.
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"They are expressed only when a recessive allele is not present" - This describes how dominant alleles function. They are expressed whenever present, but a recessive allele is expressed only when two copies are present (homozygous recessive).
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"They are expressed whenever present" - This statement accurately describes dominant alleles. If at least one dominant allele is present, its trait will be expressed in the organism.
In summary, the correct characterization related to dominant alleles is: "They are expressed whenever present." Recessive alleles, in contrast, are represented by lowercase letters, result in traits like shortness when two copies are present, and are only expressed when dominant alleles are not present.