Which breeding system involves parents that are from different inbred strains?

Which breeding system involves parents that are from different inbred strains?

• A. Outbreeding
• B. Polygamous
• C. Congenic
• D. Hybrid

Answer: (D)

Crossing parents from different inbred strains creates hybrids. This pairing brings together genetic material from two distinct backgrounds, so the offspring are heterozygous at many loci and often exhibit hybrid vigor, making them valuable for studying how traits are inherited and expressed. The other terms don’t fit as directly: outbreeding is a broader concept about avoiding close relatives, not specifically about pairing two inbred strains; congenic lines are almost identical except for a tiny region, not simply two distinct inbred parents; polygamous describes a mating pattern rather than a defined breeding system used to create distinct genetic crosslines.

Crossing parents from different inbred strains creates hybrids. This pairing brings together genetic material from two distinct backgrounds, so the offspring are heterozygous at many loci and often exhibit hybrid vigor, making them valuable for studying how traits are inherited and expressed. The other terms don’t fit as directly: outbreeding is a broader concept about avoiding close relatives, not specifically about pairing two inbred strains; congenic lines are almost identical except for a tiny region, not simply two distinct inbred parents; polygamous describes a mating pattern rather than a defined breeding system used to create distinct genetic crosslines.