Introduction to Genetics

An organism’s physical appearance or observable traits

• Genotype

• Phenotype

• Trait

• Allele

It is the genetic composition of an organism.

• Genotype

• Phenotype

• Allele

• Trait

If the pair of alleles of an individual are identical, then the genotype is said to be _____________________.

• Dominant

• Allele

• Heterozygous

• Homozygous

If the pair of alleles of an individual are different, then the genotype is said to be _____________________.

• Heterozygous

• Homozygous

• Dominant

• Recessive

Plant height is represented by the alleles T and t, where T = tall, t = dwarf.

Which is the dominant trait?

• Dwarf

• Tall

Plant height is represented by the alleles T and t, where T = tall, t = dwarf.

Which is the recessive trait?

• Dwarf

• Tall

Plant height is represented by the alleles T and t, where T = tall, t = dwarf.

If a plant is tall, what is/are its possible genotype/s?

• TT

• Tt

• tt

• TT or Tt

Plant height is represented by the alleles T and t, where T = tall, t = dwarf.

If a plant is dwarf, what is its genotype?

• TT

• Tt

• tt

• TT or Tt

In certain flower species, Red (R) is dominant over blue (r).

Which of the following phenotypes correspond to Rr?

• Red

• Purple

• Blue

In certain flower species, Red flower (R) is dominant over blue flower (r).

Which of the following genotypes correspond to blue flower?

• RR

• Rr

• rr

• RR or Rr