BSCS Biology: A Molecular Approach

Chapter 13: Patterns of Inheritance

Chapter Test

1.
Which of the following is true?
A)Identical twins share the same genes, and these genes are expressed the same way in both twins.
B)Fraternal twins share the same genes, and differences in environment explain the differences in the way the genes are expressed.
C)Fraternal twins are less alike than identical twins, but more alike than their other siblings.
D)Identical twins share the same genes, and any differences between the twins are due to the influence of environment on gene expression.
2.
How did Mendel look for patterns of inheritance?
A)He crossbred hybrid plants and analyzed the offspring.
B)He blended the genes of pure-bred plants and examined the offspring.
C)He crossbred true-breeding plants and analyzed the offspring.
D)He isolated each of seven characteristics of garden peas and bred for that characteristic alone.
3.
Homologous chromosomes carry ____.
A)the same genes and the same alleles.
B)the same genes, which may be present as different alleles.
C)different genes with the same allele sequence
D)different genes, which may be present as different alleles
4.
In the second filial generation, what ratio of dominant and recessive traits did Mendel observe?
A)2:1
B)3:1
C)4:1
D)1:01
5.
What is phenotype?
A)the genetic makeup of an organism
B)the appearance of recessive traits only
C)the appearance of dominant traits only
D)the observable characteristics of the genetic makeup of an organism
6.
The fact that alleles for each characteristic divide up independently among the gametes during meiosis is known as ____,
A)the principle of independent assortment
B)the principle of independent division
C)the principle of dihyrbridization
D)the principle of independent meiosis
7.
The lack of an active enzyme in blood indicates which blood type?
A)B
B)AB
C)O
D)A
8.
What process is being shown in the figure?
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A)nondisjunction
B)genetic recombination
C)incomplete dominance
D)chromosome theory of inheritance
9.
What is an X-linked trait?
A)a trait whose gene is never found on the X chromosome
B)a trait whose gene is found only on the X chromosome
C)a trait whose gene is expressed only when the X chromosome is dominant
D)a trait only found in females
10.
What causes Down syndrome?
A)an XO genotype
B)an XXX genotype
C)trisomy of human chromosome X
D)trisomy of human chromosome 21
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