Latest Update Genetics

BIOD210 / BIOD 210 Module 6 (Latest Update 2025 / 2026) Genetics | Questions & Answers | Grade A | 100% Correct - Portage Learning

Question:

Which two statements are true?

• Infectious heredity is a form of extranuclear heredity in which DNA is

transmitted through chloroplasts or mitochondria.

• Mitochondria house their own DNA.
• Maternal heredity is a form of extranuclear heredity in which DNA is

transmitted through chloroplasts or mitochondria.

• Infectious heredity results from the transmission of genetic information

due to an infectious species in the host cell.

Answer:

Mitochondria house their own DNA.

Infectious heredity results from the transmission of genetic information due to an infectious species in the host cell.

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Question:

The endosymbiotic theory states that:

• Free living bacteria were engulfed by eukaryotes to form a symbiotic

relationship

• • Eukaryotes were engulfed by bacteria and used for their complex cellular

machinery

• • Mitochondria were transferred into eukaryotes by primitive parasites
• • Eukaryotes still maintain a symbiotic relationship with internalized live

bacteria

Answer:

Free living bacteria were engulfed by eukaryotes to form a symbiotic relationship

Question:

True or false:

The endosymbiotic theory states that free living bacteria were engulfed by eukaryotes to form a symbiotic relationship.

Answer:

True

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Question:

Name two ways that human mtDNA is different than nuclear DNA.

Answer:

mtDNA is a double-stranded closed circle and usually has no introns. It also uses different ribosomes than nuclear DNA.

Question:

Why are mutations in mitochondria generally considered so significant (i.e why do they contribute to such a huge number of disorders)?

Answer:

Mitochondrial mutations are serious because they affect the cell's main energy source and happen more often due to less protection and repair. This can impact many body systems at once.

Question:

True or False:

Homoplasmy is the presence of a mix of mutated and normal mitochondria.

Answer:

False

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