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WorksheetsGenetics - Alleles / Dominant / Heterozygous / Phenotypes
Total questions: 18
Worksheet time: 9mins
What is a gene?
A segment of DNA that codes for a particular type of protein
A type of cell in the body
A type of virus that affects DNA
A type of protein found in DNA
What are alleles?
Alternative form of a gene
Segments of RNA that code for proteins
A chromosome
Entire strand of DNA in a chromosome
What does homozygous mean?
Having no alleles for a gene
Having two different alleles for a gene
Having two identical alleles for a gene
Having multiple alleles for a gene
Which allele gets expressed in a heterozygous individual?
Recessive allele
None of the alleles
Both alleles equally
Dominant allele
What is the phenotype of an organism?
The size of an organism
The genetic code of an organism
The physical characteristics that result from the genotype
The number of alleles an organism has
What determines the characteristics we develop?
Exercise habits
Weather conditions
Food we eat
Genes we inherit
How many alleles of each gene do we have?
One
Three
Two
Four
What is the difference between genotype and phenotype?
Genotype and phenotype are unrelated
Genotype is the genetic code, phenotype is the physical characteristics
Genotype is the physical characteristics, phenotype is the genetic code
Genotype and phenotype are the same thing
What is the reason for having different alleles for the same gene?
Variations in chromosome numbers
Due to the environmental factors
Due to the food they eat
Variations in physical characteristics
In genetics, what does dominant mean?
An allele that is rare in the population
An allele that is hidden by another allele
An allele that is never expressed
An allele that is always expressed
What is the term for having two different alleles for a gene?
Heterozygous
Homozygous
Recessive
Dominant
Which allele is expressed in a heterozygous individual?
Recessive allele
Both alleles equally
None of the alleles
Dominant allele
What determines the color of fur in a mouse?
Exercise habits
Food intake
Weather conditions
Genes coding for fur color
What is the term for having two identical alleles for a gene?
Homozygous
Heterozygous
Recessive
Dominant
What is the physical characteristic that results from the genotype called?
Phenotype
Genotype
Chromosome
Chromosome number
What is the term for having one dominant and one recessive allele for a gene?
Homozygous
Heterozygous
Recessive
Dominant
How do mutations in genes affect phenotype?
They have no effect
They always result in a different phenotype
They can alter the phenotype
They only affect genotype
What is the role of alleles in genetic diversity?
They decrease genetic diversity
They have no impact on genetic diversity
They increase genetic diversity
They determine chromosome number
