Telomeres with repetitive DNA sequences
1. Act as replicons
2. Are transcription initiators
3. Help in chromosome pairing
4. Prevent chromosome loss.

Phenotype of an organism is the result to
1. Mutations and linkages
2. Genotype and environment interactions
3. Cytoplasmic effects and nutrition
4. Environmental changes and sexual dimorphism.

In a testcross involving F₁ dihybrid flies, more parental-type offspring were produced than the recombinant type offspring. This indicates:
1. Both of the characters are controlled by more than one gene.
2. The two genes are located on two different chromosomes.
3. Chromosomes failed to separate during meiosis.
4. The two genes are linked and present on the same chromosome.