Punnet Squares
What would a punnet square look like for the below crossing of genotypes?
Aa x aa
A a
a Aa aa
a Aa aa
What is a histogram?
A histogram displaying a bell-shaped, symmetrical curve indicates this type of variation within a population.
In a standard genetic pedigree chart, this genometric shape represents an affected male.
Filled in square.
What is an allele?
This term describes the specific, alternative version of a gene that occupies a given locus on a chromosome.
This Australian bird is known for swooping unsespecting humans, including one biology teacher who recently discovered that gravity is a powerful force. What is this bird called?
Magpie
What are punnet squares used for?
Used to predict the genotypic and phenotypic ratios of offsprings.
When plotting a histogram of plyogenetic traits like human heights, this term refers to the middle where the heighest frequency of indivduals typically clusters?
The mode.
If two unaffected parents have a child who expresses a genetic condition, the condition must follow this mode of inheritance.
Recessive.
What is a phenotype?
This word refers to an organism's observable physical or physiological traits, determined by its genetic makeup and environment.
What are the 3 laws of inheritance?
Law of dominance
Law of segregation
Law of independent assortment
Are dominant traits the most common?
No, they are not always the most common traits in a population.
A histogram displaying a bell-shaped, symmmtrical curve indicates this type of variation within a population.
Normal distribution.
In a pedigree tracking a rare condition, if every affected individual has at least one affected parent and the condition does not skipp generaations, it is likely this mode of inheritance is?
Dominant.
What is codominance?
This type of phenotypic inheritance occurs when both alleles in a heterozygous organism are fully and simultaneously expressed, such as in ABO blood groups.
What is nondisjunction?
The failure of paired chromosomes or sister chromatids to separate properly during cell division
what is the total number of boxes required to construct a standard Punnet square predicting the offspring genotypes of dihybrid cross?
16 boxes, arranged in a 4x4 grid.
Environmental factors shifting a population's phenotype histogram over generations toward one extreme is an example of this specific type of natural selection.
Directional selection.
If an affected father passes a condition to all of his daughters but none of his sons, the condition most likely follows this specifc pattern
X-linked dominate pattern of inheritance.
What is a polygenic trait?
This term defines a trait controlled by the combined effects of multiple, independent genes, typically producing continuous variation.
Who first proposed the laws of inheritance?
Gregor Mandel
What is the phenotypic ratio of dyhybrid crosses?
A histogram illustrating beak depths in a population of Darwin’s finches shows two distinct peaks—one around 8 mm and another around 12 mm. What does this bimodal distribution most likely suggest about the ecological dynamics of the population?
The population may be experiencing disruptive selection or exploiting two distinct food sources requiring different adaptions.
Based on the standard rules of inheritance this is the reason why a trait cannot be classified as Y linked if it is observed in a female individual.
Females do not have a Y chromosome.
What is the Law of Independent Assortment?
This specific law of Mendelian genetics states that alleles for different traits are distributed to gametes independently of one another during meiosis.
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