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WorksheetsUnit 3 Topic 2 Vocabulary
Total questions: 29
Worksheet time: 16mins
What is an allele?
A type of cell
A form of a gene that controls a characteristic
A type of protein
A type of chromosome
Which of the following is an example of an allele?
X or Y
T or t
A or B
G or C
Diagram showing homologous chromosomes with different alleles labeled (e.g., T, t, a, A) and types of alleles (homozygous dominant, heterozygous, homozygous recessive). Which of the following correctly describes a heterozygous allele pair?
Tt
TT
tt
AA
What is a dominant allele?
An allele that is never expressed
An allele that is fully expressed whenever it is present
An allele represented with a lowercase letter
An allele that is only expressed in the absence of another allele
How is a dominant allele represented?
With a lowercase letter
With a number
With a capital letter
With a symbol
What is a recessive allele?
An allele that is always expressed
An allele that is expressed only when no dominant allele is present
An allele represented with uppercase letters
An allele that is never expressed
How is a recessive allele represented?
With uppercase letters
With numbers
With lowercase letters
With symbols
What is a genotype?
The physical appearance of an organism
The combination of genes for one or more specific traits
The environment affecting an organism
The diet of an organism
Which of the following is an example of a genotype?
Tall
Blue eyes
Aa, AA, aa
Green leaves
What does the term "phenotype" refer to?
Genetic makeup of an organism
Physical appearance of a trait
The environment of an organism
The diet of an organism
Which of the following is an example of a phenotype?
DNA sequence
Blue eye color
Blood type
Chromosome number
What does "homozygous" mean in genetics?
Having two different alleles for a gene
Having two dominant or two recessive alleles for a gene
Having one dominant and one recessive allele for a gene
Having no alleles for a gene
What does "heterozygous" mean in genetics?
Two dominant alleles for a gene
Two recessive alleles for a gene
One dominant and one recessive allele for a gene
No alleles for a gene
Which of the following is an example of a heterozygous genotype?
AA
aa
Aa
A
What is a Punnett square used for?
To predict the possible genotypes of offspring in a genetic cross
To calculate the speed of an object
To measure the temperature of a substance
To determine the age of a fossil
What is complete dominance in genetics?
A type of inheritance where one trait is completely dominant over another
A type of inheritance where traits blend together
A type of inheritance where both traits are equally expressed
A type of inheritance where traits are not inherited at all
In complete dominance, which forms of the trait can be inherited?
Only the dominant form or the recessive form
Both the dominant and recessive forms together
Neither the dominant nor the recessive form
A new form that is a mix of both
Which of the following is an example of complete dominance?
RR, rr, Rr
Rr, Rr, Rr
rr, rr, rr
RR, RR, RR
What is a sex-linked trait?
A trait associated with an allele on a sex chromosome
A trait found only in males
A trait that is inherited from the mother only
A trait that affects only physical appearance
What is selective breeding?
The natural process of animals adapting to their environment
The human practice of breeding animals or plants with desired traits
The random selection of animals for breeding
The process of animals choosing their own mates
What is incomplete dominance?
A type of inheritance where one allele completely masks the other
A type of inheritance where each allele in a heterozygous genotype influences the phenotype
A type of inheritance where alleles do not affect the phenotype
A type of inheritance where alleles are identical
What is the result of incomplete dominance in terms of phenotype?
A phenotype that is identical to one of the parents
A phenotype that is a blend of the phenotypes of the parents
A phenotype that is completely different from both parents
A phenotype that shows no influence from the alleles
What is codominance?
A type of inheritance where one allele is dominant over the other
A type of inheritance where both alleles in a heterozygous genotype contribute to the phenotype
A type of inheritance where alleles blend to form an intermediate phenotype
A type of inheritance where alleles do not affect the phenotype
What is a pedigree used for?
To trace the occurrence of a trait through generations of a family
To map the geographical location of a family
To record the financial history of a family
To list the names of family members
