In Cocker Spaniels, Black Coat Color (B) Is Dominant Over

question 41

Multiple Choice

In cocker spaniels, black coat color (B) is dominant over red (b) , and solid color (S) is dominant over spotted (s) . In the F₂ generation of a cross between BB ss with bb SS, what fraction of the offspring would be expected to be black and spotted?

• A)1/16
• B)9/16
• C)1/9
• D)3/16
• E)3/4

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Definitions:

Placenta

An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing fetus while removing waste products through the umbilical cord.

Primitive Duct Structures

Initial embryonic tubes which will later develop into various organs and systems in the body.

Wolffian

Referring to the embryonic duct system that, if stimulated by male hormones, develops into the male reproductive organs.

Mullerian

Pertaining to structures derived from the Müllerian ducts in the embryonic development of mammals, including the fallopian tubes, uterus, and part of the vagina in females.