Question

which chromosome combination determines the sex of a child, and what role does the fathers genetic contribution play?
equal contributions of x chromosomes from both parents
fathers x or y chromosome contribution
mothers x chromosome only
chromosomal mutations during meiosis
question 27
2 pts
why is random assignment an important part of experimental research?
it allows researchers to observe relationships without manipulation.
it ensures that every participant experiences the independent variable.
it guarantees the results will apply to the general population.
it helps ensure that any observed effects are due to the independent variable rather than other factors.

Explanation:

For the first question, females have XX chromosomes and always contribute an X - chromosome. Males have XY chromosomes and can contribute either an X or a Y chromosome which determines the sex of the child. For the second question, random assignment in experimental research helps to create comparable groups, reducing the influence of confounding variables so that observed effects are likely due to the independent variable.

Answer:

Father's X or Y chromosome contribution
It helps ensure that any observed effects are due to the independent variable rather than other factors.