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Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
Section 4-2 Worksheet (pgs 106-111)
Section: Traits and Inheritance
A GREAT IDEA
Circle the letter of the best answer for each question.
1. What is the ratio that Mendel found for dominant to recessive traits?
a. 1 to 1
b. 2 to 1
c. 3 to 1
d. 4 to 1
2. What do scientists call instructions for an inherited trait?
a. alleles
b. phenotype
c. albinism
d. genes
3. What are the two forms of a gene called?
a. alleles
b. phenotype
c. albinism
d. genes
Phenotype
4. What is a phenotype?
a. an inherited problem
b. a group of 10 alleles
c. a recessive gene
d. the way an organism looks
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
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Heredity
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
Circle the letter of the best answer for each question.
5. What prevents hair, skin, and eyes from having any color?
a. alleles
b. albinism
c. ratio
d. probability
Genotype
6. What are both inherited alleles together called?
a. an organism
b. a genotype
c. homozygous
d. heterozygous
7. What kind of plant has two dominant genes OR two recessive genes?
a. an organism
b. a genotype
c. homozygous
d. heterozygous
8. What kind of plant has one dominant gene AND one recessive gene?
a. an organism
b. a genotype
c. homozygous
d. heterozygous
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Heredity
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
Punnett Squares
Use the table below to answer questions 9 through 12. Circle the letter
of the best answer for each question.
9. Look at the table above. What is this table called?
a. P-grid
b. dominance chart
c. heredity map
d. Punnett square
10. What is a Punnett square used for?
a. to show recessive traits
b. to show possible offspring
c. to show dominant traits
d. to show homozygous alleles
11. Look at the table above. If purple flower color (P) is dominant, what color
will most of the offspring be?
a. purple
b. white
c. same number of purple and white
d. lavender (white and purple mix)
12. Look at the table above. What is the probability that the offspring will be
Pp?
a. 25%
b. 50%
c. 75%
d. 100%
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
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Heredity
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
More Evidence for Inheritance
Circle the letter of the best answer for each question.
13. Which two combinations of genotypes are exactly the same?
a. PP and Pp
b. Pp and pP
c. pp and Pp
d. pP and pp
WHAT ARE THE CHANCES?
Probability
14. What is the chance of a parent with one green allele and one blue allele
giving a blue allele to an offspring?
a. 100% chance
b. 25% chance
c. 50% chance
d. 75% chance
Read the description. Then, draw a line from the dot next to each
description to the matching word.
15. the chance that something will
happen
16. how probability is usually
written
17. how to find probability
18. reason traits in pea plants are
easy to predict
•
•
•
•
a. multiply
b. only two choices
c. fraction or percent
d. probability
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
16
Heredity
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
MORE ABOUT TRAITS
Incomplete Dominance
Circle the letter of the best answer for each question.
19. What is it called when each allele has its own degree of influence?
a. incomplete dominance
b. complete dominance
c. cross-breeding
d. probability
One Gene, Many Traits
20. A white tiger’s blue eyes are an example of what?
a. first-generation characteristic
b. dominant trait
c. many genes influencing one trait
d. one gene influencing more than one trait
Many Genes, One Trait
21. How many genes determine human eye color?
a. none
b. at least two
c. 1,000
d. one
The Importance of Environment
22. What can influence traits besides genes?
a. height
b. albinism
c. environment
d. phenotype
Original content Copyright © by Holt, Rinehart and Winston; a Division of Houghton Mifflin Harcourt Publishing Company.
Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
17
Heredity