1. Module 5

1.29. Page 4

Lesson 6

Module 5—Cell Division: The Processes of Mitosis and Meiosis

Self-Check

 

In this lesson you have learned about the diversity of reproductive strategies for a range of organisms. You can appreciate the variety of ways species balance their life cycles. To apply your understanding, complete the following questions.

 

Use the following information to answer the next question.

 

review


 

SC 11. Which structures in the life cycle of Ulva are haploid (monoploid)?

 

A.  zoospores and the zygote

B.  the sporophyte and the zygote

C.  zoospores and the gametophytes

D.  the sporophyte and the gametophytes

 

Use the following information to answer the next two questions.

 

Flow chart shows two identical cells U and u labeled n. They move to one cell at V labeled 2n. This cell forms a 2n W and a 2n X. The 2nW and 2nX then enlarge to form a 2n Y and a 2nZ


 

SC 12. In humans, what process must have occurred to obtain the cells at U?

 

A.  mitosis

B.  meiosis

C.  fertilization

D.  differentiation

 

SC 13. In humans, what process must occur before cell V forms cells W and X?

 

A.  mitosis

B.  meiosis

C.  recombination

D.  nondisjunction

 

Use the following information to answer the next question.

 

Diagram of the life cycle of a conifer showing a female cone producing an egg at A and male cone producing pollen grains at B. The pollen grain then forms a tube into the egg resulting in an embryo at C in a mature see on the cone scale. The seed germinates into a sporophyte seedling. It then grows into a mature tree at D


 

Numerical Response

 

SC 14. Identify the stages in the conifer life cycle, as numbered below, that correspond with the letters that represent the stages on the diagram.

 

Stages in the Conifer Life Cycle

  1. haploid stage
  2. diploid stage

Stages:                       _____             _____             _____             _____
Diagram:                    A                     B                     C                     D

 

Use the following information to answer the next question.

 

Diagram shows the life cycle of plasmodium. In process 1, a mosquito is infected with plasmodium male and female gametes. In the first stage, the gametes form a zygote which then develops into many individual plasmodium in the second stage. In process 2, when the infected mosquito stings a human, each plasmodium travels through the blood to the human’s liver cells. The liver cell bursts releasing plasmodium embedded in red blood . When the red blood cell bursts the plasmodium is released into human blood and is sucked into a mosquito when it stings the human.


 

SC 15. Identify the row in the table below that identifies the chromosome number at the first stage and the chromosome number at the second stage.

 

Row

First stage

Second stage

A.

diploid

haploid

B.

diploid

diploid

C.

haploid

diploid

D.

haploid

haploid

 

Check your work.

SC 11. C

 

SC 12. B

 

SC 13. A

 

SC 14. 1, 1, 2, 2

 

SC 15. C

 

 
Reflect on the Big Picture

 

In this lesson you have looked at a variety of life cycles found in organisms. Each cycle balances the speed and ease of mitosis with the variety and change of meiosis. Earlier you learned how those processes result in cells for growth or gamete cells for reproduction. When you completed “Thought Lab 16.2: Comparing Reprodcutive Strategies” for the Lesson 6 Assignment, you conducted research on two organisms and their reproductive strategies. You related the processes of mitosis and meiosis to the various reproductive cycles of the different organisms of your choice.

 

The Module Assessment is described in the Module Summary and Assessment section. In the Module Assessment, you will examine normal growth, repair, and reproduction in cells and organisms. You will also look into exceptions to normal cellular patterns and evaluate their impact. You will again have an opportunity to apply the patterns you explored in this lesson to your work in responding to your choice of the options provided in the Module Assessment.

 

Module 5: Lesson 6 Assignment

 

Submit your completed Module 5: Lesson 6 Assignment to your teacher for assessment.