Glencoe Science Level Blue

Chapter 2: Traits and How They Change

Standardized Test Practice

1
You cross a plant that makes round seeds with one that makes wrinkled seeds. All of the offspring have round seeds. What is the most likely genotype of the plant that makes round seeds?

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A)Rr
B)R
C)rr
D)RR
2
You cross a plant that makes yellow seeds with one that makes green seeds. All of the offspring have yellow seeds. What is the genotype of the offspring?

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A)YY
B)Y
C)Yy
D)yy
3
If one parent has two dominant alleles and the other parent has one dominant and one recessive allele for plant height, what percentage of offspring will be short?

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A)25%
B)0%
C)50%
D)100%
4
The combination between genetic makeup and the environment's effect on that makeup is called
A)genotype.
B)heredity.
C)phenotype.
D)alleles.
5
Which of these is not an example of phenotype?
A)naturally brown, curly hair
B)freckles
C)widow's peak hair line
D)blue eyes due to wearing blue contact lenses
6
If a parent has the genotype XxYyZz, how many different sex cells will be produced?
A)3
B)6
C)8
D)16
7
Which of these is the genotype of a normal female?
A)Xx
B)XX
C)XO
D)XY
8
The change in the genetics of a species over time is called
A)evolution.
B)natural selection.
C)extinction.
D)selective breeding.
9
Based on the information in the graph, species extinction was the worst

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A)between 1800 and 1830.
B)after 1980.
C)between 1920 and 1950.
D)before 1950.
10
Based on the information in the graph, how many species are expected to become extinct in the year 2010? [457_STP_Questions_ta2]
A)10,000
B)25,000
C)38,000
D)53,000
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