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Flashcards on Alleles and Genes
Click on the flashcard to see the answer
What are alleles?
Different versions of a gene
What are genes?
Segments of DNA that code for specific traits
How many alleles are typically found for a gene?
Two
What is the difference between homozygous and heterozygous alleles?
Homozygous alleles are identical, while heterozygous alleles are different
What is a dominant allele?
An allele that is expressed when present
What is a recessive allele?
An allele that is only expressed when two copies are present
What is the genotype of an individual with two identical alleles?
Homozygous
What is the genotype of an individual with two different alleles?
Heterozygous
What is the phenotype of an individual with a dominant allele?
The trait associated with the dominant allele
What is the phenotype of an individual with a recessive allele?
The trait associated with the recessive allele
What is a Punnett square used for?
To predict the possible outcomes of a genetic cross
What is the term for the genetic makeup of an individual?
Genotype
What is the term for the physical characteristics of an individual?
Phenotype
What is the likelihood of inheriting a recessive trait if both parents are heterozygous carriers?
25%
What is the likelihood of inheriting a dominant trait if one parent is homozygous dominant and the other is heterozygous?
75%
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Test Your Knowledge
What are alleles?
Different versions of a gene
Segments of DNA that code for specific traits
An allele that is expressed when present
An allele that is only expressed when two copies are present
Check Answers
What is a dominant allele?
An allele that is expressed when present
Different versions of a gene
Segments of DNA that code for specific traits
An allele that is only expressed when two copies are present
Check Answers
What is the phenotype of an individual with a dominant allele?
The trait associated with the dominant allele
Different versions of a gene
Segments of DNA that code for specific traits
An allele that is only expressed when two copies are present
Check Answers
What is the genotype of an individual with two identical alleles?
Homozygous
Heterozygous
Segments of DNA that code for specific traits
Different versions of a gene
Check Answers
What is the difference between homozygous and heterozygous alleles?
Homozygous alleles are identical, while heterozygous alleles are different
Segments of DNA that code for specific traits
An allele that is expressed when present
Different versions of a gene
Check Answers
What is a Punnett square used for?
To predict the possible outcomes of a genetic cross
Segments of DNA that code for specific traits
An allele that is expressed when present
An allele that is only expressed when two copies are present
Check Answers
What is the likelihood of inheriting a recessive trait if both parents are heterozygous carriers?
25%
Homozygous
Different versions of a gene
Segments of DNA that code for specific traits
Check Answers
What is the likelihood of inheriting a dominant trait if one parent is homozygous dominant and the other is heterozygous?
75%
Different versions of a gene
Segments of DNA that code for specific traits
An allele that is only expressed when two copies are present
Check Answers
How many alleles are typically found for a gene?
Two
An allele that is expressed when present
Segments of DNA that code for specific traits
An allele that is only expressed when two copies are present
Check Answers
What is the term for the physical characteristics of an individual?
Phenotype
Homozygous
Different versions of a gene
Segments of DNA that code for specific traits
Check Answers
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