Tennessee Science Grade 7

Chapter 8: Heredity

Heredity

1
Which of these is usually the cause of human genetic disorders?
A)genetic engineering
B)incomplete dominance
C)recessive genes
D)mucus
2
What influences whether the gene for brightly colored feathers is expressed in a bird?
A)incomplete dominance
B)internal influences
C)external influences
D)chromosome disorders
3
A person with phenotype A blood has how many possible genotypes?
A)3
B)6
C)1
D)2
4
A person with phenotype O blood has how many possible genotypes?
A)2
B)1
C)3
D)6
5
Which of these describe the allele that causes color blindness?
A)present only in males
B)dominant
C)carried on the Y chromosome
D)carried on the X chromosome
6
__________ is one type of genetic engineering, where a normal allele is placed into a virus.
A)Gene therapy
B)A color blind test
C)Polygenic inheritance
D)Down's syndrome
7
Which of these is the result of an extra chromosome?
A)influenza
B)smallpox
C)Down's syndrome
D)Color blindness
8
Where are the alleles for each parent written when using a Punnett square?
A)in the bottom two squares of the grid
B)only at the bottom of the grid
C)across the top and along the side of the grid
D)in the top two squares of the grid
9
Which pair of chromosome produces a female offspring?
A)a female X chromosome and a male X chromosome.
B)a female X chromosome and a male Y chromosome.
C)a female Y chromosome and a male Y chromosome.
D)a female Y chromosome and a male X chromosome.
10
Blood types in humans are an example of traits controlled by __________.
A)only homozygous parents
B)pedigree
C)multiple alleles
D)offspring
11
Which is true of mutations in DNA?
A)All mutations are harmful to an organism.
B)All mutations are beneficial to an organism.
C)A mutation might have no effect on an organism.
D)Mutations have no effect on an organism.
12
What controls traits in organisms?
A)recombinant DNA
B)genes
C)Punnett squares
D)organelles
13
__________ is the process Mendel used to pollinate flowers of short plants with pollen from tall plants.
A)Polygenic inheritance
B)Cross-pollination
C)Genetics
D)Mitosis
14
Mendel's pea plants were __________ for the tall-dominant trait.
A)heterozygous
B)pedigrees
C)variable
D)homozygous
15
Which of these is used to improve the phenotype of plants?
A)mitosis
B)recombinant DNA
C)chromosome disorders
D)selective breeding
16
Which of these is a trait that is produced by a combination of multiple genes?
A)DNA
B)polygenic inheritance
C)recessive alleles
D)incomplete dominance
17
Which of these describes how an organism looks?
A)its phenotype
B)its zygosity
C)its probability
D)its hybrid
18
Which pair of chromosome produces a male offspring?
A)a female Y chromosome and a male X chromosome.
B)a female X chromosome and a male Y chromosome.
C)a female X chromosome and a male X chromosome.
D)a female Y chromosome and a male Y chromosome.
19
Which process separates chromosomes?
A)meiosis
B)pedigree
C)chemosynthesis
D)inheritance
20
Which of these separates during meiosis?
A)proteins
B)pedigrees
C)alleles
D)phenotypes
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