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Genetics Test Review
Test Description: Test Review
Instructions: Answer all questions to get your test result.
1) Different forms of a gene are called...
A
Recessive
B
Alleles
C
Dominant
D
Homozygous
2) When two different alleles are present, the allele that is fully expressed is...
A
Phenotype
B
Genotype
C
Alleles
D
Dominant
3) When two different alleles are present, the allele that has no observable effect on the organism
A
Homozygous
B
Alleles
C
Recessive
D
Dominant
4) The set of alleles an organism has is its...
A
Heterozygous
B
Homozygous
C
Genotype
D
Phenotype
5) An organism's physical appearance.
A
Phenotype
B
Alleles
C
Homozygous
D
Genotype
6) When two alleles from a particular gene are different
A
Heterozygous
B
Homozygous
C
Phenotype
D
Genotype
7) When two alleles from a particular gene are the same
A
Homozygous
B
Heterozygous
C
Phenotype
D
Genotype
8) A diagram that predicts the outcomes of a genetic cross
A
Punnett Square
B
Probability
C
Pedigree
D
Genetic Disorder
9) An inherited disease or condition
A
Pedigree
B
Genetic Disorder
C
Probability
D
Punnett Square
10) the likelihood that a specific event will occur.
A
Pedigree
B
Probability
C
Genetic Disorder
D
Punnett Square
11) A family history that shows how a trait is inherited.
A
Punnett Square
B
Pedigree
C
Probability
D
Genetic Disorder
12) A plant with YY alleles for seed color is...
A
Either a or b
B
heterozygous dominant for this character
C
homozygous recessive for this character
D
homozygous dominant for this character
13) The garden pea plant is a good subject for genetic study because it...
A
is easy to grow
B
has characters in two clearly different forms
C
produces many offspring
D
all of the above
14) Which of the following is a genotype for an individual heterozygous for a trait.
A
Pr
B
tt
C
Rr
D
both a and c
15) In a pedigree, two normal parents produce a child with a genetic disorder. Based on this information, we know the disorder is caused by...
A
sex-linked allele
B
codominant allele
C
recessive allele
D
dominant allele
16) Purple (P) is a dominant allele, while white (p) is recessive. The results of a testcross are some purple plants and some white plants. What is the genotype of the original purple pea plant?
A
not enough information
B
PP
C
Pp
D
pp
17) Which of the following is not true of most sex-linked traits?
A
usually seen in males
B
located on the X chromosome
C
located on chromosomes that are not related to sex
D
usually recessive
18) When several genes influence a character, the character is said to be...
A
completely dominant
B
codominant
C
incompletely dominant
D
polygenic
19) Which of the following patterns of heredity can result in an intermediate trait, such as pink flowers produced from a white parent and a red parent
A
codominance
B
multiple alleles
C
sex-linked alleles
D
incomplete dominance
20) Which of the following is responsible or the seasonal fur color of arctic foxes, which depends on the temperature?
A
incomplete dominance1
B
environmental factors
C
codominance
D
multiple alleles
*select an answer for all questions
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