Question
Biology Question on Principles of Inheritance and Variation
Pure line breed refers to
A
heterozygosity only
B
heterozygosity and linkage
C
homozygosity only
D
homozygosity and self assortment
Answer
homozygosity only
Explanation
Solution
Pure line breeding involves a group of identical individuals that consistently produce offspring with the same characteristics when intercrossed. This breeding method relies on homozygous individuals, meaning they have two identical allelesfor a particular gene.
- Both mating breeds in pure line breeding are pure lines themselves, consisting of generations of homozygous individuals.
- The offspring produced through pure line breeding exhibit the same genotype and phenotypeas their parents, ensuring the breeding line remains consistent.
- Pure line-breeding results in true breeding genotypes, where homozygous individuals only produce offspring that are also homozygous for the same traits.
- The term "pure line breed" essentially refers to the condition of homozygosity, ensuring the offspring consistently display the desired traits.
Therefore, Option C is the correct answer.
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