Meiosis: EOC Review

During a reproductive process, paired chromosomes often swap lengths of DNA at random. This process further increases the number of new genotypes created in each generation. This helps explain why, in species that reproduce sexually, no two siblings (except identical twins) look exactly alike. With all that recombination, you can end up with your mother’s eyes, your father’s nose, and hair that combines qualities from both parents. SC.912. L.16.14

Which mechanism produces this genetic diversity?

• Mitosis

• Asexual reproduction

• Y chromosome syndrome

• Crossing-over

Answer explanation

Tags

SC.912. L.16.14

Cancer can strike anyone and at any time in a person’s life. Cancer also can strike any organ or organ system. However, the risk of developing cancer varies with age, and it varies from person to person. Many types of cancer are more common in some families than others, which means that genes play a role. Other cancers are linked to the environment. SC.912.L.16.8

What is Cancer?

• Uncontrolled meiosis

• A bacterial infection that causes swelling in body tissue

• Uncontrolled Mitosis

• A mutation in a gene that decreases cell division

Answer explanation

Tags

SC.912.L.16.8

During a science fair, Emma and Ethan observed a process under the microscope. What is the direct result of this biological process they observed?

 

• duplication of genetic material

• formation of mutations within cells

• fertilization of an egg with a sperm

• generating new combinations of alleles

Tags

NGSS.HS-LS3-2

Which diagram shows the correct results of mitosis and meiosis?

• 
• 
• 
• 

Answer explanation

You have to understand diploid and Haploid

Tags

NGSS.HS-LS1-4

Mitosis and meiosis differ in the way chromosomes move and in their number of cell divisions. A cell replicates, or copies, all its chromosomes before entering either mitosis or meiosis. In mitosis, however, each daughter cell receives an identical, complete diploid set of chromosomes.

By contrast, during Meiosis, what do daughter cells receive?

• Homologous chromosomes are separated, and each daughter cell receives 2 diploid sets of chromosomes.

• Each chromosome will divide to produce two diploid daughter cells, each of which has the same number of chromosomes

• Homologous chromosomes are separated, and each daughter cell receives only a haploid set of chromosomes

• In mitosis, the daughter cells help increase genetic variation from one generation to the next.

Answer explanation

2n = Two sets of alleles

n = One set of alleles

Tags

NGSS.HS-LS1-4

Match the following imagines of Meiosis

• Prophase 1

• 
• Anaphase 1

• 
• Metaphase 1

• 
• Telophase 1

• 

Answer explanation

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NGSS.HS-LS3-2

At the start of Meiosis II, which of the following is NOT true?

• There are two cells.

• The cells are haploid.

• The chromosomes are paired up as homologues.

• DNA is present as two sister chromatids joined at the centromere.

Match the following for mitosis and meiosis.

• Mitosis

• makes 2 identical cells

• Mitosis & Meiosis

• Homologous Chromosomes pulled apart & Independent assortment

• Meiosis

• Sister Chromatids (already crossed over) pull apart

• Anaphase 2 of Meiosis

• PMAT happens once or twice

• Anaphase 1 of Meiosis

• makes 4 genetically different cells

THE GAMETES ARE CONSIDERED TO HAVE ONE HALF OF THE GENETIC INFO SO IT IS CALL

• DIPLOID (2N)

• DIPLOID (N)

• HAPLOID (2N)

• HAPLOID (N)

A pair of homologous chromosomes (a tetrad) is composed of ​ ​ (a)   matching chromosomes, and ​ (b)   sister chromatids.

• two
• four
• one
• three