What does true-breeding mean in genetics?
A true-breeding organism, sometimes also called a purebred (biology slang: pure line or true-breeding line), is an organism that always passes down certain phenotypic traits (i.e. physically expressed traits) to its offspring of many generations.
What does a true-breeding plant mean?
true-breeding plant: a plant that always produces offspring of the same phenotype when self-fertilized; one that is homozygous for the trait being followed.
What are the true-breeding alleles?
In true breeding strains, both alleles are the same for a gene. Since there is only one kind of allele present, mating two plants from the same strain will produce offspring that have the same phenotype and genotype as their parents. Plants or animals with two identical alleles for a gene are said to be homozygous.
How do you establish true-breeding?
When two individuals that are homozygous for the same alleles are crossed, all of their offspring will all also be homozygous. The continuation of such crosses constitutes a true breeding line or strain.
What is the difference between true-breeding and cross breeding?
Terminology Pure breeding (straight breeding): the mating of two animals of the same breed; several types. Crossbreeding: is the mating of animals from two or more different breeds.
Can true-breeding be recessive?
Both dominant and recessive traits can be established in true breeding lines but the selection for true breeding parents is easiest with recessive traits.
What are the characteristics of true-breeding?
Following are the characteristic features of a true-breeding line: Self-pollination through successive generation. Stable trait inheritance through several generations. Stable expression of characters through several generations.
What genotype is true-breeding?
homozygousIn the case of a gene with multiple different alleles, the genotype of a true breeding organism is homozygous.
What does breed true mean in biology?
Biology Glossary search by EverythingBio.com. A phenotype for a simply-inherited trait is said to breed true if two parents with that phenotype produce offspring of that same phenotype exclusively.
What must true-breeding plants have?
Characteristic features of a true-breeding line are as follows:Plants should be homozygous for a trait, with both dominant or both recessive alleles. ... It also shows stable trait inheritance, that means, it produces progeny with the same characteristics for several generations.More items...•
What is a true-breeding plant and why were they important to Mendel's work?
These are plants that always produce offspring that look like the parent. By experimenting with true-breeding pea plants, Mendel avoided the appearance of unexpected traits in offspring that might occur if the plants were not true breeding.
What is a true-breeding plant quizlet?
A true-breeding plant is one that, when self-fertilized, only produces offspring with the same traits.
What is a true breeding plant?
Updated August 20, 2019. 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. True-breeding plants and organisms may express phenotypes ...
What is the gene for seed shape?
The gene for seed shape in pea plants exists in two forms, one form or allele for round seed shape (R) and the other for wrinkled seed shape (r). The round seed shape is dominant to the wrinkled seed shape. A true-breeding plant with round seeds would have a genotype of (RR) for that trait and a true-breeding plant with wrinkled seeds would have ...
Who discovered the process of gene transmission?
The process by which genes for particular traits are transmitted was discovered by the scientist and abbot Gregor Mendel (1822–1884) and formulated in what is known as Mendel's law of segregation .
What does it mean when an orgamism has a certain characteristic that is always passed on to its offspring?
if a orgamism has a certain characteristic that is always passed on to its offspring we say that this organism bred true with respect to that charastic
What is a heterozygous person?
A person who is heterozygous in a recessive genetic disorder.
Who will pass the defective allele to half her sons?
H) A woman who is a carrier for DMD will pass the defective allele to half her sons, and those sons will have DMD.
What is the probability of getting a brown blind puppy?
A) The probability of getting a brown blind puppy is 1/16.
What is the genotype of a plant with yellow round seeds?
A) The genotype of the plant with yellow round seeds will be YYRR and produce Y gametes and R gametes, while the genotype of the plant with green wrinkled seeds will be yyrr and produce y gametes and r gametes.
How many chromosomes separate during gamete formation?
A) two chromosomes separate during gamete formation such that every gamete receives both parental forms of the chromosome.
Where can recessive alleles be found?
E) Recessive alleles can be either on the maternal chromosome or the paternal chromosome.
What happens if one of the four daughter cells is diploid instead of haploid?
2) If one of the four daughter cells is diploid instead of haploid with regards to a certain chromosome, the embryo will always spontaneously abort.
Does recessive allele affect phenotype?
A) A recessive allele will have no noticeable effects on an organism's phenotype if a dominant allele is present.
