An allele that is expressed in the phenotype whenever present describes which term?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Build your vocabulary for the IGCSE Coordinated Science Exam. Study with flashcards and multiple choice questions, each with hints and explanations. Prepare for success!

Multiple Choice

An allele that is expressed in the phenotype whenever present describes which term?

Explanation:
Dominant describes an allele whose effect on the phenotype is seen whenever that allele is present, even if the other chromosome has a different allele. In a heterozygous organism, the dominant allele determines the trait, masking the recessive one. Only if both copies are the recessive version does the recessive trait appear. For example, in many organisms the tall-height allele is dominant over the short-height allele, so a plant with one tall and one short allele grows tall. This is why the term described is dominant.

Dominant describes an allele whose effect on the phenotype is seen whenever that allele is present, even if the other chromosome has a different allele. In a heterozygous organism, the dominant allele determines the trait, masking the recessive one. Only if both copies are the recessive version does the recessive trait appear. For example, in many organisms the tall-height allele is dominant over the short-height allele, so a plant with one tall and one short allele grows tall. This is why the term described is dominant.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy