Question 1

If a haploid cell goes through meiosis it will generate

Accepted Answer

Meiosis cannot start with a haploid cell since homologous pairs cannot be made,among other things.Pleae see section 9.6 for more information.

Question 2

The Y chromosome

Accepted Answer

The X chromosome is much larger than the Y.Please see section 9.2 for more information.

Question 3

If a diploid cell goes through meiosis it will generate

Accepted Answer

Meiosis starts with a diploid cell that duplicates its DNA,leading to a 4N state.Since the ending cells are haploid,and no DNA is destroyed,there must be four cells at the end of meiosis.Please see section 9.6 for more information.

Question 4

If you were told that you would get extra credit for finding a model showing chromsomes separating while sister chromatids were still attached,you would look for a model of

Accepted Answer

At the end of anaphase I,chromosomes separate to opposite poles,but meiosis II still need to occur.Please see section 9.4 for more information.

Question 5

Genes A and B are on the same chromosome.If a person has one chromosome with the alleles AB and a second chromosome with the alleles ab,how could they produce a gamete with a chromosome containing the alleles Ab or aB?

Accepted Answer

Crossing over allows for combinations on the same resulting chromosome from two different hoologs.Please see section 9.5 for more information.

Question 6

What is an advantage of sexual reproduction over asexual reproduction?

Accepted Answer

The genetic variation generated by sexual reproduction provides a pool for adpating to changes and disasters in the environment.This has been long recognized by indigenous farmers and,more recently,by operators of seed banks.Please see section 9.2 for more information.

Question 7

Alternate forms of the same gene

Accepted Answer

Alleles are foundf at the same location on different homologous chromosomes and have somewhat different sequences.Please see section 9.2 for more information.

Question 8

Sexual reproduction and meiosis generate genetic variety by

Accepted Answer

Meiosis genertes genetic variety by several means,including crossing over,which benefits a species in the adaptability of the progeny resulting.Please see section 9.5 for more information.

Question 9

The process by which homologous chromosomes exchange genetic material

Accepted Answer

The process of genetic exchange during meiosis is called "crossing over" because DNA literally crosses from one homologous chromosome to another.Please see section 9.5 for more information.

Question 10

People who have a single X chromosome are female,while those with XXY sex chromosomes are males.In order to be a female,a human

Accepted Answer

Sex chromosome systems vary in how they work,with the human system requiring no Y be present for an organisms to be female.Please see section 9.2 for more information.

Question 11

If a haploid cell goes through mitosis it will generate

Accepted Answer

Mitosis produces cells with identical genetic contents to the starting cells.Please see section 9.6 for more information.

Question 12

Genes A and B are on the same chromosome.What gametes could an individual with the allele combination AABB produce?

Accepted Answer

Each gamete gets one allele per gene.Please see section 9.5 for more information.

Question 13

Why is it essential that meiosis produce haploid cells?

Accepted Answer

Fusion of haploid gametes restores the normal diploid state when a zygote forms.

Question 14

In meiosis,homologous chromosomes align next to one another during

Accepted Answer

homologous chromosomes align during meiosis I so that crossing over can occur.Please see section 9.4 for more information.

Question 15

Nondisjunction may cause

Accepted Answer

A number of genetic disorders result from nondisjunction and the imbalance of chromosomes which result.Please see section 9.7 for more information.

Question 16

A gamete having more than one complete set of chromosomes

Accepted Answer

ggametes are normally haploid,so any extra sets of chromosomes point to polyploidy.Please see section 9.7 for more information.

Question 17

When chromosomes fail to separate at either the first or second meiotic division,this

Accepted Answer

Nondisjunction occurs when two copies of a chromosome fail to separate,resulting in gametes with one more and one less than the normal complement of chromosomes.Please see section 9.7 for more information.

Question 18

What process creates daughter cells with a mixture of paternal and maternal chromosomes?

Accepted Answer

Crossing over involves a physical exchnage of DNA between homlogous chromosomes.for more information.

Question 19

If a diploid cell goes through mitosis it will generate

Accepted Answer

Diploid cells produce diploid cells by mitosis since mitosis copies cells without altering their DNA content.Please see section 9.6 for more information.

Question 20

In meiosis,DNA replicates during

Accepted Answer

Meiosis,by having one replication but two divisions,reduces the cells it produces to haploidy.Please see section 9.4 for more information.

Quiz 9: Sexual Reproduction and Meiosis