A breeder performs a test cross to determine the genotype of a black cat. he crosses the black cat (BB or Bb) with a white cat (bb). if 50 percent of the offspring are black, what is the genotype of the black cat

Why would a tumor on the pituitary gland affect the thyroid gland and also tims levels of testosterone

In one species of bird, there are three varieties of leather color, What is this an example of? ecosystem diversity species diversity genetic diversity color diversity

Activators are proteins that bind to regions of DNA and increase the rate of transcription of specific genes. Repressors, on the other hand, are proteins that decrease the transcription of specific genes.

Which of the following is not part of a chromosome? A. A strand of DNA B. A gene C. Many proteins D. Many strands of RNA

Which statement is usually correct about reading rock layers

Which two inner planets have water in the form of ice?

Which sentences describe star clusters?

Which of the following is an advantage of nuclear energy over fossil fuels? A. Eliminates the need for mining. B. Uses a renewable energy source. C. Releases less CO2 waste products. D. Releases more CO2 waste products.

A cell with 46 chromosomes inside itsnucleus goes through one round of mitosis and cytokinesis. How manychromosomes are inside each of the two resulting nuclei?

The theory that explains how the earths surface is made up of moving rocky plates is called: A. Supercontinent B. Plate tectonics C. Sea floor spreading D. Continental drift