Chromosomes and Mitosis

Name______Class______Date______

Skills Worksheet

Chromosomes and Mitosis

Look-Alikes

In the space provided, write the letter of the term or phrase that best describes how each numbered item looks.

_____1.super coil

_____2.chromosome

_____3.metaphase

_____4.genes in a chromosome

_____5.spindle

Work-Alikes

In the space provided, write the letter of the term or phrase that best describes how each numbered item functions.

_____6.karyotype

_____7.homologous chromosomes

_____8.stages of mitosis

_____9.haploid cell

_____ 10. cell cycle

Cause and Effect

In the space provided, write the letter of the term or phrase that best matches each cause or effect given below.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology15Chromosomes and Mitosis

Name______Class______Date______

Cause

11.______

12.mitosis

13.______

14.______

15.cell plate forms

16.changes in chromosome structure

Effect

start of mitosis

______

development of male

Down syndrome

______

______

a.plant cell separates

b.trisomy 21

c.Y chromosome

d.nuclear membrane dissolves

e.one nucleus becomes two nuclei

f.mutations

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology15Chromosomes and Mitosis

Name______Class______Date______

Chromosomes and Mitosis continued

Linkages

In the spaces provided, write the letters of the two terms or phrases that are linked together by the term or phrase in the middle. The choices can be placed in any order.

17.______mitosis ______

18.______synthesis (S) phase ______

19.______anaphase ______

20.______DNA synthesis (G2)

checkpoint ______

21.______protein may not

function ______

Analogies

An analogy is a relationship between two pairs of terms or phrases written as
a : b :: c : d. The symbol : is read as “is to,” and the symbol :: is read as “as.” In the space provided, write the letter of the pair of terms or phrases that best completes the analogy shown.

_____ 22. chromosome : DNA and protein ::

a.gene : centromere c. spindle fiber : microtubule

b.chromatid : gamete d. centromere : chromatid

_____ 23. homologous pair : chromosomes ::

a.chromatid : chromosomes c.chromosome: chromatids

b.egg : gametes d. gamete : zygotes

_____ 24. prophase :telophase ::

a.prophase : metaphase c. anaphase : telophase

b.metaphase : anaphase d. telophase : metaphase

_____ 25. metaphase : meet ::

a.anaphase : separate c. telophase : double

b.prophase : double d. telophase : lineup

Skills Worksheet

Sexual Reproduction and Meiosis

Work-Alikes

In the space provided, write the letter of the term or phrase that best describes how each numbered item functions.

____1.anaphase I

____2.crossing-over

____3.metaphase I

____4.meiosis II

____5.telophase I

____6.prophase I

____7.independent assortment

____8.random fertilization

Cause and Effect

In the space provided, write the letter of the term or phrase that best matches each cause or effect given below.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology18Sexual Reproduction and Meiosis

Name______Class______Date______

Cause

9.______

10.meiosis I and II

11.______

12.repair of damaged DNA

Effect

first cell of new individual

______

gametes join by fusion.

______

a.gametes

b.eggs and sperm join

c.all cells of organisms are haploid cells

d.possible explanation of evolution of sexual reproduction

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology18Sexual Reproduction and Meiosis

Name______Class______Date______

Sexual Reproduction and Meiosis continued

Trade-offs

In the space provided, write the letter of the bad news item that best matches each numbered good news item below.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology18Sexual Reproduction and Meiosis

Name______Class______Date______

Good News

____ 13. Agricultural breeding increases the sizes of domesticated animals.

____ 14. The ovum produced by oogenesis is very large.

____ 15. Asexual reproduction allows organisms to reproduce quickly.

____ 16. Sexual reproduction makes different combinations of genes quickly

Bad News

a.Organisms must use energy to produce gametes and find mates.

b.The ability to obtain larger animals slows down.

c.They may be at a disadvantage in a changing environment.

d.Two polar bodies produced die.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology18Sexual Reproduction and Meiosis

Name______Class______Date______

Linkages

In the spaces provided, write the letters of the two terms or phrases that are linked together by the term or phrase in the middle. The choices can be placed in any order.

17.______meiosis II ______

18.______independent assortment ______

19.______crossing-over ______

20.______individuals split off ______

Sexual Reproduction and Meiosis continued

Analogies

An analogy is a relationship between two pairs of terms or phrases written as
a : b :: c : d. The symbol : is read as “is to,” and the symbol :: is read as “as.” In the space provided, write the letter of the pair of terms or phrases that best completes the analogy shown.

____ 21. chromatids : crossing-over ::

a.gametes : chromosomes

b.metaphase : anaphase

c.hook : fishing rod

d.tires : changing flat tire

____ 22. asexual reproduction : clone ::

a.spermatogenesis : ovum

b.fission : budding

c.meiosis : gamete

d.fragmentation : budding

____ 23. haploid life cycle : fusion ::

a.diploid life cycle : fusion

b.diploid life cycle : fertilization

c.fertilization : gametes

d.gametes : fertilization

____ 24. sporophyte : spore ::

a.sexual reproduction : clone

b.spore : sporophyte

c.gamete : spore

1. gametophyte : gamete

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Science: Biology18Sexual Reproduction and Meiosis