Answer to Question #109405 in Genetics for Alexa Reed

Question

16.1A - In a species of river otters, having brown fur is dominant to black fur.

A brown male otter is cross-bred in captivity with a female who has black fur.

The pairing produces 6 otter pups; 4 of whom have brown fur, and 2 with black fur.

From these offspring, one can conclude:
Group of answer choices

The brown-furred father's genotype is homozygous recessive

The black-furred mother's genotype is heterozygous

The black-furred mother's genotype is homozygous dominant

The brown-furred father's genotype is heterozygous

The brown-furred father's genotype is homozygous dominant

The question cannot be answered without more information

Answer 1

Otter with brown fur - genotype Aa or AA

Otter with black fur - genotype aa

So we have pups with brown fur and pups with black fur, then father's genotype is heterozygous. 

P: Aa x aa

G: A, a x a

F₁: Aa : aa

Thus the answer is: The brown-furred father's genotype is heterozygous.