Which of the following statements about pattern formation are true? Select the four statements that are true. View Available Hint(s) Select the four statements that are true. Pattern formation begins in adult animals.
Homeotic genes establish major body axes.
Differential gene expression affects the developmental process in animals.
Cells receive molecular signals that communicate their position in relation to other cells.
Homeotic genes code for transcription factors that control the development of segment-specific body parts.
The process of pattern formation involves segmentation of the body but does not involve the development of segment-specific body parts.
Positional information controls pattern formation

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Afamily has a y-linked disease that affects the father. what is the chance of a male offspring inheriting the same disease? oa. 100% ob. 50% oc. 25% d. 0%

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.