Crossing over is important because....

It allows for more genetic diversity of gametes.

It prevents mutations from entering the gametes.

It allows for even distribution of chromosomes in the gametes.

It allows for genetic uniformity of gametes.

one-half of a set of chromosomes

Which of the following best describes meiosis?

It occurs only in cells in the reproductive structures of an organism

It is carried out in all tissues theat require cell replacement

It happens in all of the tissues except the brain and spinal cord

It is the first stage of mitosis

The synaptonemal complex __________.

physically connects homologous chromosomes during prophase I

physically connects homologous chromosomes during mitosis

is broken down by enzymes during anaphase II

is formed by a protein called cohesin

The major contribution of sex to evolution is that __________.

it provides a method to increase genetic variation.

it is the only mechanism for species to reproduce.

it provides a way in which somatic mutations can be inherited.

it provides a method to increase genetic variation and it provides a way in which somatic mutation can be inherited.

it is the only mechanism for species to reproduce and it provides a method to increase genetic variation.

During what phase does the process shown occur?

This is a form of non-disjunction and not a normal process in cell division

What is one of the advantages of sexual reproduction over asexual reproduction?

genetic variation allows for adaptability in the population over time

there is less of an energy cost for the organism

genetically identical offspring means there is less chance of mutation

What does this process accomplish?

This creates new combinations of genes on a single chromosome; resulting in genetic variation

This process reduces the number of chromatids per chromosome

This process reduces the chromosome number (diploid to haploid)

This is a form of non-disjunction and not a normal process in cell division

What does "random orientation (independent assortment) of homologs" refer to

how one set of homologous chromosomes is lined up compared to another set during metaphase I

the random exchange of cenetic info between pieces of homologous chromsomes

the fact that there are different alleles on the homologous pairs

the randomness of which particular sperm will fertilize an egg

Which of the following are sources of genetic diversity? (CHECK ALL THAT APPLY)

independent assortment of homologous pairs

What is one disadvantage of sexual reproduction?

Energy, time and a little bit of luck needed to find and fuse with another gamete

Offspring are exact copies of parents

Genetic diversity in the next generation

AP Meiosis 19

Authored by Martha Pace

Biology

9th - 12th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Chiasmata are most closely related to which of the following?

crossing over

fertilization

cytokinesis

mitosis

body

sex

somatic

brain

Tags

NGSS.HS-LS3-2

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AP Meiosis 19

Chiasmata are most closely related to which of the following?

If a stem cell has 24 chromosomes, how many will it have at the end of meiosis?

When does crossing over occur?

Trisomy is a genetic disorder that ________

Meiosis results in ______.

The chromosomes that pair up during meiosis, are called __________ chromosomes.

The purpose of meiosis is to form ________ cells.

Crossing over helps promote

The two ways to increase genetic variation during meiosis are crossing over and _____

How many cells are created during Telophase II?

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