Genotype & Phenotype

How can you determine if an organism is homozygous or heterozygous?

• By examining the organism's physical traits.

• By analyzing the organism's DNA sequence.

• By examining the alleles: if they are the same, it is homozygous; if they are different, it is heterozygous.

• By observing the organism's behavior in different environments.

What is an example of a Homozygous Recessive genotype?

• AA (two dominant alleles)

• Bb (one dominant and one recessive allele)

• bb (two recessive alleles)

• AB (one of each allele)

What does Heterozygous mean?

• Having two identical alleles for a particular gene (e.g., BB or TT).

• Having one dominant and one recessive allele for a particular gene (e.g., Bb).

• Having two different alleles for a particular gene (e.g., Bb or Tt).

• Having no alleles for a particular gene.

What is the difference between Dominant and Recessive alleles?

• Dominant alleles require two copies to express their trait, while recessive alleles express their trait even if only one copy is present.

• Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express their trait.

• Dominant alleles are always more common in a population than recessive alleles.

• Recessive alleles can never be expressed in the presence of dominant alleles.

What does Homozygous mean?

• Having two identical alleles for a particular gene (e.g., BB or bb).

• Having two different alleles for a particular gene (e.g., Bb).

• Having one allele for a gene that is dominant and one that is recessive.

• Having no alleles for a particular gene.

What is the phenotype of an organism with the genotype Tt?

• Tall (because T is dominant)

• Short (because t is recessive)

• Medium height (intermediate phenotype)

• Variable height (depends on environment)

What is the genotype for a Tall plant if T is the dominant allele for height?

• TT (homozygous dominant)

• Tt (heterozygous)

• tt (homozygous recessive)

• T (dominant allele only)

What is an example of a Homozygous Dominant genotype?

• AA (two dominant alleles)

• Bb (one dominant and one recessive allele)

• BB (two dominant alleles)

• Aa (one dominant and one recessive allele)

What does it mean if an organism has a phenotype of 'blue eyes'?

• It refers to the observable trait, which is influenced by the underlying genotype.

• It indicates the organism's genetic makeup is entirely recessive.

• It suggests that the organism has a higher chance of survival in the wild.

• It means the organism has a mutation in its DNA.

What is an example of a Heterozygous genotype?

• AA (two dominant alleles)

• bb (two recessive alleles)

• Bb (one dominant and one recessive allele)

• AB (two different alleles of the same gene)