20. There are four children in the Smith family. One childhas blue eyes and blond hair. The other three children have brown eyes and blond hair. How can you explain this difference in eye color? Eye coloris an inherted brait, Both parents were homozygous dominant for eye color. The blue eyed child is younger than the children with brown eyes.their eyes will become broin Eye coloris an inherited trait, Both parents were hererozygous for eye color. Brown eyes are the inherited trait, blue eyes are a mutation. The brown eyed children have spent a lot of time outdoors, it's an environmental clange

## Step 1<br />The problem is about understanding the inheritance of eye color in humans. Eye color is determined by the type and amount of pigments in the eye's iris. The most common colors are blue, green, and brown. The inheritance of eye color is a complex trait that is influenced by multiple genes.<br /><br />## Step 2<br />The statement "Eye color is an inherited trait" is correct. Eye color is indeed an inherited trait, meaning it is passed down from parents to their children.<br /><br />## Step 3<br />The statement "Both parents were homozygous dominant for eye color" is incorrect. If both parents were homozygous dominant for eye color, it would mean they both had two copies of the dominant allele for brown eyes. In this case, it would be highly unlikely for them to have a child with blue eyes, as blue eyes are a recessive trait.<br /><br />## Step 4<br />The statement "The blue-eyed child is younger than the children with brown eyes, their eyes will become brown" is incorrect. Age does not determine eye color. Eye color is determined by genetics, not age.<br /><br />## Step 5<br />The statement "Brown eyes are the inherited trait, blue eyes are a mutation" is incorrect. While it is true that brown eyes are the more common inherited trait, blue eyes are not a mutation. They are a recessive trait that can be inherited.<br /><br />## Step 6<br />The statement "The brown-eyed children have spent a lot of time outdoors, it's an environmental change" is incorrect. While exposure to sunlight can cause the eyes to darken, this is not the primary determinant of eye color.<br /><br />## Step 7<br />The statement "Eye color is an inherited trait, Both parents were heterozygous for eye color" is correct. If both parents are heterozygous for eye color, it means they each have one dominant allele (for brown eyes) and one recessive allele (for blue eyes). In this case, there is a 25% chance that a child could inherit the recessive allele from both parents and have blue eyes.