What percentage of the offspring of two homozygous parents will inherit the transgene?

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Multiple Choice

What percentage of the offspring of two homozygous parents will inherit the transgene?

Explanation:
When both parents are homozygous for the transgene, they each have two copies of that transgene. Every gamete they produce carries the transgene allele. When these gametes combine, every offspring receives a transgene copy from each parent, so all offspring inherit the transgene. In this cross, that means 100% of the offspring carry the transgene. If one or both parents weren’t homozygous, the proportion would be less than all offspring.

When both parents are homozygous for the transgene, they each have two copies of that transgene. Every gamete they produce carries the transgene allele. When these gametes combine, every offspring receives a transgene copy from each parent, so all offspring inherit the transgene. In this cross, that means 100% of the offspring carry the transgene. If one or both parents weren’t homozygous, the proportion would be less than all offspring.

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