Dominat Vs. Recessive Flashcards
(14 cards)
What is the definition of dominant traits?
Traits that hide other traits
Dominant traits are expressed even when only one allele is present.
What are recessive traits?
Traits that are masked by dominant traits
Recessive traits only appear when two copies of the allele are present.
How are dominant traits represented in a pedigree?
By a filled circle for females and a filled square for males
This visual representation helps track the inheritance of traits.
What is an acquired trait?
A physical characteristic of an organism not passed down genetically
Acquired traits result from environmental influences or experiences.
What does the term ‘homozygous’ mean?
Made up of two identical alleles
Homozygous individuals can be either dominant (e.g., BB) or recessive (e.g., bb).
What is the definition of heterozygous?
Made up of two different alleles
Heterozygous individuals have one dominant and one recessive allele (e.g., Bb).
Fill in the blank: A __________ shows the occurrence and appearance of phenotypes across generations.
pedigree
Pedigrees are useful for tracking genetic traits through family history.
What do Punnett squares help determine?
The probability of inheriting alleles
Punnett squares visualize potential genetic combinations from parental alleles.
True or False: All traits are inherited genetically.
False
Some traits, like acquired traits, are influenced by the environment and not inherited.
What does it mean when a trait is described as ‘dominant’?
It is expressed even if only one allele is present
Dominant traits overshadow recessive traits in phenotype expression.
What is the probability of a recessive trait being expressed?
It occurs only if two recessive alleles are present
This means the individual must be homozygous recessive (e.g., bb).
List two characteristics of recessive traits.
- Masked by dominant traits
- Only expressed in homozygous individuals
Recessive traits can be carried by heterozygous individuals without being expressed.
What is the role of alleles in determining traits?
Alleles are variations of a gene that determine specific traits
The combination of alleles from both parents determines the phenotype of the offspring.
Pedigress graph
Circle represent females squares represent males
