Final answer:
In autosomal recessive inheritance, true statements include that two heterozygotes will usually have affected offspring 25% of the time, the trait often skips a generation, and all children of two affected individuals will also be affected. Traits aren't usually present in every generation and affected individuals do not inherit a dominant gene from an affected parent.
Step-by-step explanation:
The question asks to identify true statements about autosomal recessive inheritance. In this inheritance pattern, traits are expressed phenotypically only when two recessive alleles are present. Here are the assertions that are true:
- Two heterozygotes will generally have affected offspring 25% of the time.
- The trait often skips a generation.
- All offspring of two affected individuals will be affected.
While two heterozygous parents (both carriers) have a 25% chance with each child to produce an offspring with a recessive disorder, this doesn't guarantee the exact distribution for any given number of offspring due to the influence of chance.
It's also true that autosomal recessive traits often skip generations because carriers do not exhibit the symptoms. If both parents are affected (homozygous recessive), then all their children will inherit the condition. However, it's not true that the trait is usually present in every generation — as that is more characteristic of autosomal dominant inheritance. Additionally, affected individuals do not inherit a dominant gene from an affected parent in the context of recessive inheritance.