FUVEST 2018 - Questão 45 - Nos cães labradores a cor da pelagem preta chocolate ou dourada depende

Nos cães labradores a cor da pelagem preta chocolate ou dourada depende da interação entre dois genes, um localizado no cromossomo 11 (alelos B e b) e o outro, no cromossomo 5 (alelos E e e). O alelo dominante B é responsável pela síntese do pigmento preto e o alelo recessivo b, pela produção do pigmento chocolate. O alelo dominante E determina a deposição do pigmento preto ou chocolate nos pelos; e o alelo e impede a deposição de pigmento no pelo. Dentre 36 cães resultantes de cruzamentos de cães heterozigóticos nos dois lócus com cães duplohomozigóticos recessivos, quantos com pelagem preta, chocolate e dourada, respectivamente, são esperados? (A) 0, 0 e 36. (B) 9, 9 e 18. (C) 18, 9 e 9. (D) 18, 0 e 18. (E) 18, 18 e 0. #fuvest2018 #fuvest2023 #epistasia #quibio #resumãodovitão

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