Meiosis and Life Cycles Flashcards

Questions and Answers

What are the three main types of life cycles?

Zygotic, gametic and sporic meiosis (correct)

Cell division, differentiation, and meiosis

Mitosis, fertilization, and binary fission

None of the above

What is a zygote?

Product of the fertilization of two gametes

What is a spore?

Haploid cell produced by meiosis in sporophyte (2n) individual with no fertilization needed

What is meiosis?

2n cells to 1n Signup and view all the answers

What is mitosis?

2n cells to 2n cells Signup and view all the answers

Describe zygotic meiosis.

Zygote divides by meiosis to form 4 haploid cells; haploid cells divide by mitosis to form haploid individuals; gametes formed via differentiation; no diploid life stage. Signup and view all the answers

Describe gametic meiosis.

Haploid gametes formed by meiosis in diploid individuals; gametes fuse to form diploid zygote, which divides via mitosis to form new diploid individual. Signup and view all the answers

Describe sporic meiosis.

Haploid spores produced by sporophyte (2n); undergo mitosis to produce gametophytes (1n); haploid gametes fuse to form diploid zygote that divides via mitosis to produce sporophyte (2n). Signup and view all the answers

Study Notes

Types of Meiosis

Three main life cycle types: zygotic, gametic, and sporic meiosis.

Zygote

Defined as the product formed from the fertilization of two gametes.

Spores

Haploid cells produced by meiosis in sporophyte (2n) individuals; they can develop without fertilization.

Meiosis

A process that reduces diploid (2n) cells to haploid (1n) cells.

Mitosis

Process that results in the duplication of diploid (2n) cells into identical diploid cells.

Zygotic Meiosis

Zygote immediately divides by meiosis, producing four haploid cells.
The haploid cells then undergo mitosis, leading to haploid individuals; gametes are formed through differentiation.
No diploid stage exists in this cycle.

Gametic Meiosis

Involves the formation of haploid gametes via meiosis in diploid individuals.
The fusion of gametes generates a diploid zygote.
The zygote subsequently undergoes mitosis to create a new diploid individual.

Sporic Meiosis

Begins with the production of haploid spores from the sporophyte (2n).
Spores undergo mitosis to generate gametophytes (1n).
Gametes produced from gametophytes fuse to create a diploid zygote, which then undergoes mitosis to form a new sporophyte (2n).

Description

Explore the three main types of life cycles: zygotic, gametic, and sporic meiosis. This quiz provides essential definitions and concepts related to meiosis, zygotes, and spores. Understand the differences between meiosis and mitosis through concise flashcard entries.