If two Bb guinea pigs cross, there are four possible outcomes:
- both pass the B: the son is BB
- one of the pass the B and the other pass the b: the son is Bb
- both pass the b: the son is bb
Since B (being black) is dominant, the son will be black in both BB and Bb cases. In order for a son to be brown, he must be a pure bb specimen.
So, if all of the offspring are black, it means that all four guinea pigs are either BB or Bb, which in turn means that at least one of the parents passed the B gene.
Answer:
Wind
Tides
Geothermal energy
Explanation:
1. Wind does not contaminate and is inexhaustible.
2. Tides are due to gravitational interaction with the Moon and Sun and the Earth's rotation, so it is classified as inexhaustible.
3. Geothermal energy is renewable because heat is continuously being produced inside the Earth, at the core.
Answer: An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
Explanation:
Answer and Explanation:
In suspension cultures (liquid media), it has been demonstrated that single cells can regenerate to form an entire plant, and undergoes all the natural stages of embryo development.
Totipotent stem cells give rise to all types of cells including the placenta and embryo in animals.Pluripotent cells on the other hand are cells that are capable of self-renewing into the three different germ layers of an embryo forming an adult without giving rise to placenta. As the embryo grows, it develops into multipotent cells.
Five changes associated with aging include
1. There is progressive reduction in physical health due to loss of muscle tissue
2.There is occurrence of vision changes whereby it becomes impaired in older people
3. Skin becomes less elastic and age spots and wrinkles appear on the skin
4. Hearing also becomes impaired
5. length of sleep at night massively decreases.