Male house cats are either black or orange; females are black, orange, or calico. If these coat-color phenotypes are governed by a sex-linked gene, how can these observations be explained?….
What do you think might happen if more than one sperm were able to penetrate the cell membrane of an egg?
1. Predicting Results What do you think might happen if more than one sperm were able to penetrate the cell membrane of an egg?
2. Evaluating Differences A human female produces, on average, only one mature egg every 28 days. In contrast, a female salmon lays 50 million eggs at each spawning. Hypothesize why there is such a great difference in egg production between the two species.
3. Recognizing Relationships Women who consume tobacco, alcoholic beverages, or other drugs or harmful substances during pregnancy are at high risk of giving birth to infants who are addicted to drugs, have severe birth defects, or tend to develop learning disabilities. Explain.