: a homogeneous line of descent: as. a : a group of closely related individuals of identical genetic constitution (as the offspring of a homozygous self-fertilized parent) : a line of descent theoretically realizable from the inbreeding of completely homozygous and comparable parents.
What are homozygous pure lines?
-The pure line is true-breeding genotypes. It is a line that in successive generations has been made homozygous with all genes under consideration. It is a line in which homozygous individuals only bear homozygous offspring like parents. Therefore, pure line breed only applies to homozygosity.
What is the meaning of pure line?
The definition of a pure line is a result of inbreeding where animals or plants have certain characteristics that are the same through generations. An example of a pure line is the result of inbreeding of a certain flower to help it fight off diseases. noun.
Can pure lines be heterozygous?
Pure lines are obtained through repeated self-fertilization of heterozygous individuals or consanguineous crosses in heterozygous populations. … Thus, about 20 generations of crosses between a brother and a sister from each generation may be carried out to produce a pure line of mammals.
Is pure line the same as purebred?
Pure line is true breeding genotypes, line that has been rendered homozygous for all genes under consideration in successive generations, a line in which homozygous individuals produce only homozygous offspring like parents. Thus, pure line breed refers to homozygosity only.
What is an example of heterozygous?
Your genes are made of DNA. … If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair.
What is meant by homozygous?
Listen to pronunciation. (HOH-moh-ZY-gus JEE-noh-tipe) The presence of two identical alleles at a particular gene locus. A homozygous genotype may include two normal alleles or two alleles that have the same variant.
How do you get a pure line?
Pure-line selection generally involves three more or less distinct steps: (1) numerous superior appearing plants are selected from a genetically variable population; (2) progenies of the individual plant selections are grown and evaluated by simple observation, frequently over a period of several years;…
Why did Mendel use pure lines?
Mendel used pure lines in his experiment because he needed a control group, and to ensure that the traits in his new generations of pea plants were…
What does a 3 1 ratio mean in genetics?
The F2 generation always produced a 3:1 ratio where the dominant trait is present three times as often as the recessive trait. Mendel coined two terms to describe the relationship of the two phenotypes based on the F1 and F2 phenotypes.
What are examples of purebred?
Purebred is defined as an animal or human which is the result of unmixed breeding. An example of purebred is a cat whose parents were both Siamese. Of or relating to an animal having both parents of the same breed or variety. A purebred animal.
Are purebreds homozygous?
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.