In humans, free-ear lobes are dominant to attached. Two parented that are both heterozygous free are expecting a child. What are the chances that the child will
have free ear lobes of attached?
Key:
Parents & Gametes:

And can you show it in a Punnet square

See the answer below

Explanation:

First, let us assume that the allele for free ear lobes to be represented by A. Thus, the recessive attached earlobe would be a.

The genotype for the heterozygous parents would each be Aa.

          Aa    x    Aa

      AA   Aa   Aa   aa (see the attached image for the Punnet's square)

Offspring:

1/4 AA - free ear lobes

1/2 Aa - free ear lobes

1/4 aa - attached ear lobes

Hence

Probability of the child having free ear lobes = 3/4 or 75%

Probability of the child having attached ear lobes = 1/4 or 25%

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.