Stem Cell Niches Quiz

Play an AI-generated podcast conversation about this lesson

What maintains the physical attachments between homologous chromosomes during late prophase?

Homologous recombination and ionizing radiation
Non-crossover events and pairing centers
Chiasmata and sister chromatid cohesion (correct)
Synaptonemal complex and double strand breaks

What occurs in the first meiotic division to the parental homologs?

They experience a non-crossover event
They are linked by a pairing center
They are disjoined to reduce ploidy to the haploid state (correct)
They undergo non-homologous end joining

What leads to genetic exchange during meiosis?

Non-crossover events
Homology recognition region
Synaptonemal complex
Recombination (correct)

What is extruded as a polar body during oocyte meiosis?

One of the two end products of each division (C) Signup and view all the answers

In which part of the adult hermaphrodite anterior gonad arm does a syncytium form due to incomplete cytokinesis?

Distal germ line with a central canal called rachis (D) Signup and view all the answers

Which structures specifically disjoin in the second meiotic division?

Sister chromatids (A) Signup and view all the answers

Where are Germline Stem Cells (GSCs) located in C.elegans?

Close to the Distal Tip Cell (DTC) (D) Signup and view all the answers

What is the function of the Distal Tip Cell (DTC) in C.elegans?

Regulating the germline stem cells (D) Signup and view all the answers

In which zone do cells transition from mitosis to meiosis in the C.elegans germ line?

Germline transition zone (B) Signup and view all the answers

What is the role of DSBs in meiotic prophase of oogenesis in C.elegans?

Formation of homologous recombination (C) Signup and view all the answers

Which structure anchors the ventral uterine precursor (VU) in C.elegans?

Anchor cell (AC) (D) Signup and view all the answers

What is the main function of Germline Stem Cells (GSCs) in C.elegans?

Control of mitosis progression (D) Signup and view all the answers

What is the main function of the Distal Tip Cell in the C.elegans germline stem cell niche?

Promoting mitosis and inhibiting meiosis of germ cells (C) Signup and view all the answers

Why is promoting mitosis of Germline Stem Cells (GSCs) important within the niche?

To maintain the pool of stem cells (A) Signup and view all the answers

How is mitosis maintained by the Distal Tip Cell (DTC) in the C.elegans germline stem cell niche?

Through its intimate contact with germline stem cells (B) Signup and view all the answers

In the context of the stem cell niche, what is the significance of Notch-Delta Signaling?

Maintaining self-renewal and differentiation of stem cells (D) Signup and view all the answers

Which type of proteins are involved in Notch-Delta Signaling in the context of the stem cell niche?

Transmembrane proteins (C) Signup and view all the answers

Apart from promoting mitosis, what other function does the Distal Tip Cell perform within the C.elegans germline stem cell niche?

Elongating the gonadal arm during development (B) Signup and view all the answers