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

question 35

Multiple Choice

Unattached earlobes (EE or Ee) are dominant over attached earlobes (ee) . A couple has unattached earlobes. Both notice that one of their parents on both sides have 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 genotype ratios are possible.

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Definitions:

Standard Deviation

A statistic that measures the dispersion or variability of a dataset relative to its mean.

Standard Deviation

An indicator of the spread or fluctuations in a data set, showing the degree to which the data points deviate from the average value.

Parameter

A numerical characteristic of a statistical population, such as a mean or standard deviation, that describes some aspect of the population.

Simple Random Sample

A sample in which each member of the population has an equal chance of being selected.