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Flashcards · Biology · Inheritance

Alleles, Genotype and Phenotype

16 cards

  1. What is an allele?

    A different version of the same gene.

  2. How many alleles of a gene does a body cell have?

    Two, one from each parent.

  3. What is a dominant allele?

    One that shows its effect even if only one copy is present.

  4. What is a recessive allele?

    One that only shows its effect if two copies are present.

  5. How are dominant and recessive alleles written?

    Dominant with a capital letter, recessive with the lower-case letter.

  6. What does homozygous mean?

    Two identical alleles.

  7. What does heterozygous mean?

    Two different alleles.

  8. What is a genotype?

    The alleles an organism has, such as Tt.

  9. What is a phenotype?

    The characteristic that the organism shows.

  10. What is the phenotype of Tt if T is dominant for tall?

    Tall.

  11. What genotype must a plant have to be dwarf, if dwarf is recessive?

    tt.

  12. Does a gamete have one or two alleles of a gene?

    One.

  13. What is a carrier?

    A person with one recessive allele who does not show the disorder but can pass it on.

  14. What genotype does a person with cystic fibrosis have?

    ff (two recessive alleles).

  15. Does dominant mean most common?

    No. A dominant allele can be rare.

  16. Why can two plants have the same phenotype but different genotypes?

    TT and Tt both show the dominant phenotype.