AP BIOLOGY

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: -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-3: -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-4: -A homozygote is “an organism with identical pairs of genes with respect to any given pair of hereditary characters, and therefore breeding true for that character.” In other words, it’s an organism that has two copies of the same allele for a particular trait.

Detailed explanation-5: -Homozygous, or homozygosity, refers to the inheritance of genes from each biological parent. The variant results from a mutation that changes the DNA sequence making up a gene. Experts refer to variations in genes as alleles. If the alleles are identical, a person is homozygous for that gene.