GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
an organism that produces offspring of the same variety generation over generation, with homozygous genotype
|
|
an organism that produces offspring of the same variety generation over generation, with heterozygous genotype
|
|
an organism with homozygous dominant genotype only
|
|
None of the above
|
Detailed explanation-1: -In Mendelian genetics, this means that an organism must be homozygous for every trait for which it is considered true breeding; that is, the pairs of alleles that express a given trait are the same. In a purebred strain or breed, the goal is that the organism will “breed true” for the breed-relevant traits.
Detailed explanation-2: -A kind of breeding in which the parents with a particular phenotype produce offspring only with the same phenotype. Supplement. A true breeding is a kind of breeding wherein the parents would produce offspring that would carry the same phenotype. This means that the parents are homozygous for every trait.
Detailed explanation-3: -Two organisms that are described as true-breeding for a trait, when crossed, will always produce offspring with the same genotype as them for that trait. This means true-breeding organisms are homozygous for the true-breeding trait, It is important to remember that this applies both dominant or recessive traits.
Detailed explanation-4: -Purebred-Also called HOMOZYGOUS and consists of gene pairs with genes that are the SAME. Hybrid-Also called HETEROZYGOUS and consists of gene pairs that are DIFFERENT. Genotype is the actual GENE makeup represented by LETTERS. Phenotype is the PHYSICAL appearance of a trait, such as a YELLOW (or BLUE) body color.
Detailed explanation-5: -A true-breeding plant is one that, when self-fertilized, only produces offspring with the same traits. True-breeding organisms are genetically identical and have identical alleles for specified traits. The alleles for these type of organisms are homozygous.