Gene expression is --
How does transcription and translation result in the expression of genes?
The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year.
What causes this change in fur color?
Environmental factors, such as temperature, diet, or light, can cause cells to activate different genes at different times. For example, flamingos have pink feathers whenever they eat shrimp because they produce proteins called carotenoids. However, they turn pale white if they do not eat enough shrimp.
Which of these best explains the effect of environmental factors on gene expression?
Lactose intolerance is a condition common in adults that makes it more difficult to digest lactose, the sugar found in dairy products. The data table below shows the amount of lactose digested at various age groups.
Based on the information in the table, why is lactose intolerance more common in adults than infants?
Testosterone is a hormone found in both males and females. Testosterone levels change over time. During puberty, certain hormones testosterone trigger changes in the body. For example, many boys experience voice cracking as their voice deepens or start to produce more body odor as they sweat.
What factor best explains the variation in testosterone levels in males and females?
The diagram shows a process that occurs during the development of an organism.
Which statement explains how the different cell types in the image are formed?
