Biology Chapter 7
Terms in this set (25)
Effects from alleles of multiple genes that all contribute to the ultimate phenotype for a given characteristic.
Alternative versions of a gene.
An individual who carries one allele for a recessive trait .
the fusion of male and female gametes ( sex cells) from different individuals of the same species.
The case in which the heterozygote displays characteristics in both alleles.
Describes an allele that masks phenotypic effect of the other, recessive, allele for a trait; shown in homozygous and heterozygous genotypes.
The genes that an organism carries for a particular trait, also an organisms genetic composition.
The greater resemblance of offspring to parents than to other individuals in the population , a consequence of the passing of characteristics from parents to their offspring from genes.
Describes the genotype of a trait for which the two alleles an individual carries differs from each other.
Describes the genotype of a trait for which the two alleles are the same.
type of inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype .
Genes that are close together on a chromosome, and are likely to be inherited together.
Mendels law of independent assortment
states that allele pairs separate independently during the formation of gametes. The inheritance of one trait does not influence another.
Mendels law of segregation
states that allele pairs separate or segregate during gamete formation, and randomly unite at fertilization. Half gametes carry one allele and the other half carry the others.
The case in which a single gene has more than two possible alleles.
A type of family tree that maps the occurrence of a trait in a family, often over many generations.
The manifested structure, function, and behaviors of an individual, the expression of a genotype as an organism.
A phenomenon in which an individual gene influences multiple traits.
Describes a trait that is influenced by multiple different genes.
a diagram that is used to predict an outcome of a particular cross or breeding experiment.
Describes an allele whose phenotypic effect is masked by a dominant allele for a trait.
Sex linked trait
A trait controlled by a gene on a sex chromosome.
Single gene trait
A trait that is determined by instructions on only one gene; ex. Cleft chin.
A test cross is a way to explore the genotpye of an organism. Early use of the test cross was as an experimental mating test used to determine what alleles are present in the genotype.
is an organism that always passes down a certain phenotypic trait to its offspring.