Answer:
To determine which kind of allele results in the expression of the green color trait in the individuals shown, we need some additional information. Specifically, we need to know the inheritance pattern of the trait and whether it is linked to a specific chromosome.
If the trait is X-linked, meaning it is located on the X chromosome, and it is recessive, then the correct answer would be "1. X-linked recessive." In this case, males would need to inherit the green color allele only from their mother, as they receive their X chromosome from her. Females would need to inherit the green color allele from both parents.
If the trait is X-linked and dominant, then the correct answer would be "2. X-linked dominant." In this case, both males and females would express the green color trait if they inherit the green color allele.
If the trait is autosomal (not linked to the sex chromosomes), and it is dominant, then the correct answer would be "3. dominant." In this case, individuals would only need to inherit one copy of the green color allele from either parent to express the trait.
If the trait is autosomal and recessive, then the correct answer would be "4. recessive." In this case, individuals would need to inherit two copies of the green color allele (one from each parent) to express the trait.