Unattached Earlobes (EE or Ee) Are Dominant Over Attached Earlobes

question 63

Multiple Choice

Unattached earlobes (EE or Ee) are dominant over attached earlobes (ee) . A couple both have unattached earlobes but each one has a parent with attached earlobes (ee) . Therefore, they correctly assume that they are carriers for attached earlobes (Ee) . If the couple proceeds to have four children, then

• A) they can be certain that three will be heterozygous and one homozygous recessive.
• B) if the first three are heterozygous, the fourth must be homozygous recessive.
• C) the children must repeat the grandparents' genotype (Ee).
• D) all children must have unattached earlobes since both parents possess the dominant gene for it.
• E) two heterozygous, one homozygous dominant, and one homozygous recessive is a likely outcome, but all heterozygous, or two, three, or all four homozygous is also possible.

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