What question did this study set out to answer?

Determine the incidence and distribution of deleterious recessive genes in dairy bulls selected at random.

November 30, 1946Genetics

Deleterious Recessive Genes in Dairy Bulls Selected at Random

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Genetic investigation uncovers deleterious recessive alleles in randomly selected dairy bulls, indicating a high prevalence of hidden genetic load.

Determine the incidence and distribution of deleterious recessive genes in dairy bulls selected at random.
Evaluation of randomly sampled dairy bulls using pedigree records and progeny testing schemes.
Breeding trials designed to uncover masked recessive phenotypes through structured matings.
Randomly selected dairy sires carried multiple masked deleterious recessive alleles despite normal outward appearance.
Phenotypic defects manifested exclusively in offspring receiving homozygous recessive allele pairs from carrier parents.

Mead et al. (1946) studied this question.

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Genetic investigation uncovers deleterious recessive alleles in randomly selected dairy bulls, indicating a high prevalence of hidden genetic load.