Questions and Answers
What is polygenic inheritance?
What is an allele?
A version of a gene
What is codominance?
When both alleles are fully and separately expressed
What are autosomes?
Signup and view all the answers
What does recessive mean in genetics?
Signup and view all the answers
What is meant by sex-linked genes?
Signup and view all the answers
What is the law of independent assortment?
Signup and view all the answers
What is a karyotype?
Signup and view all the answers
What is a protein?
Signup and view all the answers
What does heterozygous mean?
Signup and view all the answers
What is a gene?
Signup and view all the answers
What are linked genes?
Signup and view all the answers
What does dominant mean?
Signup and view all the answers
What is a phenotype?
Signup and view all the answers
Study Notes
Polygenic Inheritance
- Involves multiple genes influencing a single trait.
- Examples include height and skin color, demonstrating variation in phenotypes.
Allele
- Represents a variant form of a gene.
- Dominant alleles determine specific characteristics or traits.
Codominance
- Occurs when both alleles in a heterozygous genotype are fully and distinctly expressed.
- An example of codominance can be seen in certain blood types where both alleles contribute to the phenotype.
Autosomes
- Comprise chromosomes 1-44 in humans.
- Non-sex chromosomes, consisting of 22 pairs, with one pair being sex chromosomes.
Recessive
- An allele that is only expressed in a homozygous state, meaning both copies must be the recessive form.
- Example: The long-hair gene in animals is a recessive trait.
Sex Linked
- Genes that are located on sex chromosomes, primarily the X chromosome.
- Traits linked to genes on the X or Y chromosome are referred to as sex-linked traits.
Law of Independent Assortment
- States that genes separate independently during meiosis due to the random alignment of chromosomes during metaphase.
- Important principle in Mendelian genetics regarding inheritance patterns.
Karyotype
- A visual representation of a complete set of chromosomes, arranged in homologous pairs.
- Useful in genetic analysis and can be obtained via techniques like amniocentesis.
Protein
- Essential macromolecules that perform various functions in the body and express traits.
- Composed of chains of amino acids, highlighting the role of proteins in biological processes.
Heterozygous
- A genotype characterized by the presence of two different alleles inherited from each parent.
- Example: An organism that is heterozygous for eye color has different alleles for that trait.
Gene
- A specific segment of DNA on a chromosome that encodes for a single protein.
- Key in determining various traits and traits expression.
Linked Genes
- Genes located close together on the same chromosome, increasing the likelihood of being inherited together.
- These genes can influence similar phenotypic traits due to their proximity on the chromosome.
Dominant
- An allele that overshadows the effect of another allele in a heterozygous organism.
- Dominance reflects the strength of influence a particular allele has on trait expression.
Phenotype
- Refers to the observable physical characteristics of an organism resulting from the genotype.
- Phenotypic expression reflects both genetic and environmental influences on an organism.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of key genetics terms with these flashcards. Learn about polygenic inheritance, alleles, and other essential concepts that shape our understanding of heredity. Perfect for anyone looking to brush up on their biology vocabulary.