Tennessee Science Grade 7

Section 2: Genetics Since Mendel

Self-Check Quiz - English

1
__________ is the production of a phenotype that is between two homozygous parents.
A)A sex-linked gene
B)A hybrid
C)Genetic engineering
D)Incomplete dominance
2
A person with phenotype O blood has how many possible genotypes?
A)6
B)1
C)3
D)2
3
Blood types in humans are an example of traits controlled by __________.
A)multiple alleles
B)offspring
C)only homozygous parents
D)pedigree
4
A person with phenotype A blood has how many possible genotypes?
A)2
B)1
C)6
D)3
5
What influences whether the gene for brightly colored feathers is expressed in a bird?
A)external influences
B)incomplete dominance
C)chromosome disorders
D)internal influences
6
Which of these is a trait that is produced by a combination of multiple genes?
A)incomplete dominance
B)recessive alleles
C)polygenic inheritance
D)DNA
7
Which is true of mutations in DNA?
A)All mutations are beneficial to an organism.
B)A mutation might have no effect on an organism.
C)All mutations are harmful to an organism.
D)Mutations have no effect on an organism.
8
Which pair of chromosomes produces a female offspring?
A)a female Y chromosome and a male Y chromosome.
B)a female Y chromosome and a male X chromosome.
C)a female X chromosome and a male X chromosome.
D)a female X chromosome and a male Y chromosome.
9
Which pair of chromosome produces a male offspring?
A)a female Y chromosome and a male Y chromosome.
B)a female X chromosome and a male X chromosome.
C)a female X chromosome and a male Y chromosome.
D)a female Y chromosome and a male X chromosome.
10
Which of these is usually the cause of human genetic disorders?
A)mucus
B)genetic engineering
C)recessive genes
D)incomplete dominance
11
Which of these is the result of an extra chromosome?
A)Down's syndrome
B)Color blindness
C)smallpox
D)influenza
12
Which of these describe the allele that causes color blindness?
A)dominant
B)carried on the X chromosome
C)carried on the Y chromosome
D)present only in males
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