Eduqas A Level Biology Mitosis Meiosis 2021 Revision Questions and Answers

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Molly Gowar

09/07/2022

Biology

Mitosis and Meiosis Revision Questions

Subjects

Biology

Cell biology

Cell divison

Mitosis and the cell cycle

Eduqas A Level Biology Mitosis Meiosis 2021 Revision Questions and Answers

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Mitosis and Meiosis: Essential Cell Division Processes in A-Level Biology

Cell division through mitosis and meiosis forms a crucial component of Eduqas A Level Biology Component 2. These processes ensure genetic continuity and variation in living organisms.

Key points:

Chromosomes are DNA-protein structures carrying genetic information
Homologous chromosomes A Level Biology concepts include paired chromosomes from each parent
Mitosis produces genetically identical daughter cells
Meiosis creates genetic variation through crossing over and independent assortment
Diploid definition A Level Biology refers to cells containing two sets of chromosomes
Haploid definition A Level Biology describes cells with one set of chromosomes

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09/07/2022

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Mitosis and Meiosis Revision Questions
1. What is a chromosome?
A chromosome is a long, thin structure of DNA and protein in the nucleus if

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Page 2: Homologous Chromosomes and Cell Cycle

This page delves into homologous chromosomes, ploidy levels, and introduces the cell cycle for Eduqas A Level Biology students.

Key concepts covered:

Homologous pairs of chromosomes
Diploid and haploid cells
Ploidy levels and polyploidy
Definition of mitosis
Overview of the cell cycle
Main stages of the cell cycle

Definition: Diploid refers to having two complete sets of chromosomes, symbolized as 2n. In humans, the diploid number is 2n = 46.

Highlight: Homologous chromosomes are matching pairs that are identical in size and shape, carrying genes for the same characteristics but potentially different alleles.

Vocabulary: Ploidy level - the number of complete sets of chromosomes in an organism.

Example: Human body cells are diploid $2n$ , while gametes are haploid $n$ .

View

Page 3: Mitosis and Its Stages

This page focuses on the process of mitosis and its stages, crucial for Eduqas A Level Biology students studying cell division.

Key points covered:

Detailed explanation of interphase
Five stages of mitosis
Description of prophase and metaphase

Definition: Mitosis is a type of cell division producing two genetically identical daughter cells.

Highlight: Interphase is the longest phase of the cell cycle, involving significant metabolic activity and DNA replication.

Vocabulary: S phase - the part of interphase where DNA replication occurs $synthesis phase$ .

Example: During prophase, chromosomes condense and become visible, while the nuclear envelope disintegrates and the spindle forms.

View

Page 3: The Cell Cycle and Interphase

The page details the cell cycle, focusing on interphase as the longest and most metabolically active phase.

Highlight: Interphase involves cell growth, organelle replication, and DNA synthesis.

Definition: The S phase $synthesis$ is when DNA replication occurs during interphase.

Vocabulary: Chromatin refers to the dispersed nuclear material when chromosomes aren't visible.

View

Page 4: Cytokinesis in Different Cell Types

This section compares cytokinesis in animal and plant cells, highlighting their distinct division mechanisms.

Example: Animal cells divide through constriction at the equator, while plant cells form a cell plate.

Vocabulary: Cytokinesis is the process of cytoplasm division following nuclear division.

View

Page 5: Significance of Mitosis

The importance of mitosis in maintaining genetic stability and enabling growth is explained.

Highlight: Mitosis produces genetically identical daughter cells with the same chromosome number as the parent cell.

Example: Mitosis enables tissue repair, asexual reproduction, and growth in organisms.

View

Page 6: Introduction to Meiosis

The page explains why meiosis is necessary and describes its two main divisions.

Highlight: Without meiosis, chromosome numbers would double each generation.

Definition: Meiosis I separates homologous chromosomes, while meiosis II separates sister chromatids.

View

Page 7: Genetic Recombination

This section focuses on crossing over and genetic variation during meiosis.

Definition: Crossing over involves DNA exchange between chromatids of homologous chromosomes.

Highlight: This process creates new combinations of alleles, increasing genetic variation.

View

Page 8: Meiosis Completion and Significance

The final stages of meiosis and its biological importance are detailed.

Highlight: Meiosis maintains constant chromosome numbers across generations while creating genetic variation.

Example: Crossing over in prophase I and independent assortment in metaphase contribute to genetic diversity.

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Subjects

Biology

Cell biology

Cell divison

Mitosis and the cell cycle

Biology

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9 Jul 2022

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9 pages

Eduqas A Level Biology Mitosis Meiosis 2021 Revision Questions and Answers

Molly Gowar

@mollygowar

Mitosis and Meiosis: Essential Cell Division Processes in A-Level Biology

Cell division through mitosis and meiosis forms a crucial component of Eduqas A Level Biology Component 2. These processes ensure genetic continuity and variation in living organisms.

Key points:... Show more

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Page 2: Homologous Chromosomes and Cell Cycle

This page delves into homologous chromosomes, ploidy levels, and introduces the cell cycle for Eduqas A Level Biology students.

Key concepts covered:

Homologous pairs of chromosomes
Diploid and haploid cells
Ploidy levels and polyploidy
Definition of mitosis
Overview of the cell cycle
Main stages of the cell cycle

Definition: Diploid refers to having two complete sets of chromosomes, symbolized as 2n. In humans, the diploid number is 2n = 46.

Highlight: Homologous chromosomes are matching pairs that are identical in size and shape, carrying genes for the same characteristics but potentially different alleles.

Vocabulary: Ploidy level - the number of complete sets of chromosomes in an organism.

Example: Human body cells are diploid $2n$ , while gametes are haploid $n$ .

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Page 3: Mitosis and Its Stages

This page focuses on the process of mitosis and its stages, crucial for Eduqas A Level Biology students studying cell division.

Key points covered:

Detailed explanation of interphase
Five stages of mitosis
Description of prophase and metaphase

Definition: Mitosis is a type of cell division producing two genetically identical daughter cells.

Highlight: Interphase is the longest phase of the cell cycle, involving significant metabolic activity and DNA replication.

Vocabulary: S phase - the part of interphase where DNA replication occurs $synthesis phase$ .

Example: During prophase, chromosomes condense and become visible, while the nuclear envelope disintegrates and the spindle forms.

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Page 3: The Cell Cycle and Interphase

The page details the cell cycle, focusing on interphase as the longest and most metabolically active phase.

Highlight: Interphase involves cell growth, organelle replication, and DNA synthesis.

Definition: The S phase $synthesis$ is when DNA replication occurs during interphase.

Vocabulary: Chromatin refers to the dispersed nuclear material when chromosomes aren't visible.

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Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Page 4: Cytokinesis in Different Cell Types

This section compares cytokinesis in animal and plant cells, highlighting their distinct division mechanisms.

Example: Animal cells divide through constriction at the equator, while plant cells form a cell plate.

Vocabulary: Cytokinesis is the process of cytoplasm division following nuclear division.

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Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Page 5: Significance of Mitosis

The importance of mitosis in maintaining genetic stability and enabling growth is explained.

Highlight: Mitosis produces genetically identical daughter cells with the same chromosome number as the parent cell.

Example: Mitosis enables tissue repair, asexual reproduction, and growth in organisms.

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Page 6: Introduction to Meiosis

The page explains why meiosis is necessary and describes its two main divisions.

Highlight: Without meiosis, chromosome numbers would double each generation.

Definition: Meiosis I separates homologous chromosomes, while meiosis II separates sister chromatids.

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Page 7: Genetic Recombination

This section focuses on crossing over and genetic variation during meiosis.

Definition: Crossing over involves DNA exchange between chromatids of homologous chromosomes.

Highlight: This process creates new combinations of alleles, increasing genetic variation.

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Page 8: Meiosis Completion and Significance

The final stages of meiosis and its biological importance are detailed.

Highlight: Meiosis maintains constant chromosome numbers across generations while creating genetic variation.

Example: Crossing over in prophase I and independent assortment in metaphase contribute to genetic diversity.

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Page 1: Chromosome Structure and Basic Concepts

This page introduces fundamental concepts related to chromosomes and cell division in Eduqas A Level Biology.

Key points covered:

Definition and structure of chromosomes
Relationship between chromosomes and DNA
Genes as sections of DNA coding for specific polypeptides
Visibility of chromosomes during cell division
Chromatids and centromeres
Species variation in chromosome numbers
Human chromosome count $46$
Definition of haploid cells

Definition: A chromosome is a long, thin structure of DNA and protein in the nucleus of eukaryotic cells, carrying genes.

Vocabulary: Chromatid - one of two identical copies of a chromosome, joined at the centromere, prior to cell division.

Highlight: Chromosomes only become visible when chromatin condenses prior to cell division, after DNA replication.

Example: Humans have 46 chromosomes in their body cells, but this number varies among different species.

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Eduqas A Level Biology Mitosis Meiosis 2021 Revision Questions and Answers

Page 2: Homologous Chromosomes and Cell Cycle

Page 3: Mitosis and Its Stages

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Still not convinced? See what other students are saying...

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

The app is very simple and well designed. So far I have always found everything I was looking for :D

I love this app ❤️ I actually use it every time I study.

Eduqas A Level Biology Mitosis Meiosis 2021 Revision Questions and Answers

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Page 1: Chromosome Structure and Basic Concepts

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