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Tortoise shell or calico cats are always ________________ for O locus that is responsible for orange color development.(a) Homozygous(b) Heterozygous(c) Deleterious(d) DuplicationI have been asked this question in a national level competition.I'd like to ask this question from Dosage Compensation Mechanism for X linked Genes in section Chromosomes and Sex Determination of Cytogenetics

Answer»

Correct answer is (b) Heterozygous

Easy explanation: The O GENE is responsible for orange color DEVELOPMENT. Only dominant O can express it over the mutant B gene that causes black color. O gene is located in X CHROMOSOME. Thus in heterozygous condition if O CARRYING X chromosome is inactivated it leads to black patch as SEEN here.



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