Which of the following mechanisms could negatively impact embryo development in humans? a mutation in a master regulator transcription factor needed for prefrontal cortex cell formation the introduction of a toxin that alters the genetic regulatory cascade for ovary development proper functioning of morphogens a failure of apoptosis to target the cells that formed "webbing" between the fingers and toes A, B, and D Which of the following likely has the most Hox genes? Jellyfish Slugs Dolphins Bees Similar gill pouches in embryos of a chick, human, and cat are an example of ) structural homology developmental homology ) genetic homology ) the inheritance of acquired characters

Which of the following statements about sex determination in Drosophila is false?     Males transcribe sex-lethal, females do not.     The X/A ratio controls the transcription of sex-lethal.     Double-sex RNA is spliced differently in males and females.     Transformer regulates the splicing of double-sex RNA.     Functional transformer protein is only produced in females.

One example of an oncogene is ras. Ras is a G protein that is activated when growth factors bind to a G protein-coupled receptor. The mutated form of ras binds to GTP but does not allow the GTP to be broken down to GDP. Ras is involved in both the G¡ and G2 checkpoints. What happens to cells that have this mutated form of ras? O A. They divide when they should not. O B. They don't divide when they should. O C. They enter mitosis without going through the S phase of the cell cycle. D. They enter cytokinesis without going through the M phase of the cell cycle. of 50 Answered MacBook Air 吕口 F3 g88 FA F5 F6 F7 F2 # $ % & 2 3 4 6 7 9 Q W E T Y A S F

Stem cells have the potential to become any cell in the body. What changes when they begin to undergo cellular differentiation? -selected genes undergo demethylation -all genes in the cell undergo demethylation selected genes undergo acetylation -all genes in the cell undergo acetylation