A A - Science 10 - Home

Name ________ _ __ _____ Class _ _____ Date _ _ __

1 - 3 SECTION Genetics and Probability

(pages 24-28)

- - - - - - - - - KEY CONCEPTS - - - - - - - - -

A Probability can be used to predict the results of genetic crosses.

A In addition to probability, a special chart called a Punnett square is used to show the possible gene combinations in a cross between two organisms.

? Building Vocabulary Skills: Analyzing Information A phenotype refers to ____________________ A genotype is the _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ __

Using the definitions you stated, answer the questions about the following diagram.

p

F1

B

B

b

~..., G>

~~,~,._ _(~

X

B ?...l,....,..-.~:: ~''"et,-,''''

l~,,,.._~4:,;;;~,,....1\J''i.?

Bb

Bb

BB

A

B

B

bb

A

b

b

b

Bb

Bb

1. What are the phenotypes of the parents? 2. What are the genotypes of the parents? _ _ _ _ _ __ _ _ _ _ _ _ _ _ __ 3. What are the phenotypes of the offspring? _______________ 4. What are the genotypes of the offspring? _ _______________

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'I

F1

F2

B

b

B

BB

X

B

b

Bb

A

b

B

b

Bb

1ti'.

._a

~ .

f ~

Bb

j ;;-:---'";'"r"''"'''''~' "?it

(( :J4'::J, ir,i;.

,..._ '

4 ..

bb

1. What are the phenotypes of the parents? - -- - -- - -- - - -- - - - -- 2. What are the genotypes of the parents? ____________________ 3. What are the phenotypes of the offspring? __________________ 4. What are the genotypes of the offspring? ___________________ 5. How can you explain the fact that the offspring that has a BB genotype and one that has

a.Bb genotype are both black? _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

6. Can a white offspring be a hybrid? Why? _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

10 ? E Heredity: The Code of Life

Name _________________ Class ____ _ _ Date _ _ __

? Putting It Together: Applying the Main Ideas Demonstrate your understanding of Punnett squares and probability by completing the test cross in the Punnett square and answering the questions.

p

8

b

b

X

Bb

A

B

b

bb

A

b

b

b

After completing the Punnett square show the relationship between the Punnett square and probability by answering these questions. 1. What is the probability of getting a white offspring from this cross?

2. What is the probability of getting a black purebred offspring from this cross? Note: Read this question carefully and think about it.

3. Can you explain your answer?

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Name _ __ _ _ _ _ _ _ __ _ _ _ _ _ Class _ _ _ _ _ _ Date _ _ __

REVIEW AND REINFORCEMENT GUIDE CHAPTER 2 ? How Chromosomes Work

2 -1 SECTION The Chromosome Theory

(pages 34-39)

- - - - - - - - KEY CONCEPTS - - - - - - - -

.._ According to the chromosome theory, genes are carried from parents to their offspring on chromosomes.

& The main function of chromosomes is to control the production of substances called proteins.

? Building Vocabulary Skills: Making Identifications Examine the following diagram, then answer the following questions.

Male

@

i

@

/\

({j) ?

I\ I\

_!J ~~ _tJ

I

I

I

4 Sperm

Chromosomes double First cell division

Second cell division

Female

(fil)

i

?

/\

@ ?

I

?

~

1 Egg

\ I\

@@ @

I

I

I

3 Polar bodies

1. Identify the process illustrated in the diagram. _ _ _ _ _ _ _ _ _ __ _ _ _ __ 2. In your own words, describe this process.

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3. Identify the structures in the diagram to the left.

Female Male

4. In your own words, describe these structures.

5. What are the objects identified by letters? _ _ _ _ __ _ _ __ __ _ _ _ _ __ 6. Explain the function of the objects identified by letters.

? Seeing Relationships: Using the Main Ideas In your own words, write a complete statement relating each pair of words. I. Genes, chromosomes

2. Chromosomes, proteins

14 ? E Heredity: The Code of Life

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