inal answer:
It is biologically impossible to have a child with a YY chromosome configuration, as females have XX chromosomes and males have XY. A mother can only contribute an X chromosome, so the child can either be XX (female) or XY (male), depending on the father's contribution.
Step-by-step explanation:
The question posed by the student touches on human genetics, specifically regarding the possibility of having a child with a YY chromosome configuration. It is important to clarify that it is not possible for a human child to be YY. In human genetics, females typically have two X chromosomes (XX) and males have one X and one Y chromosome (XY). The Y chromosome is only inherited from the father, which means that for a child to exist, they must inherit an X chromosome from their mother and either an X or a Y chromosome from their father.
Therefore, there is always a 50:50 chance that a child will be male or female depending on whether the father's sperm contributes an X or a Y chromosome. This is due to the fact that a mother can only pass on an X chromosome. As a result, the combinations that can occur are either XX (female) or XY (male). A YY combination is biologically impossible because the mother does not carry a Y chromosome to contribute.
When talking about genetics, it's common to refer to Mendelian inheritance where one dominant and one recessive allele (represented as 'Y' and 'y') determine traits such as pea plant color; however, this is different from the sex chromosomes in humans. In such genetic crosses, we can have allele combinations like YY, Yy, and yy, predicting traits in peas, but this terminology should not be confused with human sex chromosome determination.