GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
describes the genotype of a trait for which the two alleles an individual carries are the same
|
|
|
in genetics a type of family tree that maps the occurrence of a trait in a family often over many generations
|
|
|
a trait that is determined by instructions on only one gene examples are a cleft chin a widows peak and unattached earlobes
|
|
|
None of the above
|
Detailed explanation-1: -Homozygous, as related to genetics, refers to having inherited the same versions (alleles) of a genomic marker from each biological parent. Thus, an individual who is homozygous for a genomic marker has two identical versions of that marker.
Detailed explanation-2: -(HOH-moh-ZY-gus JEE-noh-tipe) A term that describes having two identical versions of the same gene (one inherited from the mother and one inherited from the father). In a homozygous genotype, either both genes are normal or both genes have the same mutation (change).
Detailed explanation-3: -Homozygous (and its less common form homozygotic) means “relating to a cell that has two identical alleles for a particular gene at corresponding positions on homologous chromosomes.”
Detailed explanation-4: -We all have two alleles, or versions, of each gene. Being homozygous for a particular gene means you inherited two identical versions. It’s the opposite of a heterozygous genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.
Detailed explanation-5: -When the loci in the matching chromosomes bear the same alleles, it is described as homozygous. It means that the alleles code for the same trait. A ‘homozygous’ organism for a particular trait is described to possess either a pair of dominant alleles (e.g. AA) or a pair of recessive alleles (e.g. aa).