Answer:
Explanation:
chel Carson was born just over 100 years ago in 1907. ... 1. Silent Spring was directed against the chemical industry and its production of deadly pesticides. ... “the elimination of the use of persistent toxic pesticides should be the goal”—as ... chemicals has shifted from cancer and the potential for genetic
When two atoms react, they form either of two kinds of bond, ionic bonds or covalent bonds.
Ionic bonds are the type of bonds where there is transfer of electrons from one atom to another. The electrons are removed and from one atom and attached to another. A good example is salt which is composed of sodium and chlorine. Sodium readily loses one of its electrons and chlorine readily accepts it. Before losing the electron, sodium has a positive charge, but then becomes negatively charged after giving up the electron. Chlorine has a positive charge before gaining the electron but becomes negatively charged after gaining the electron. These opposite charges between sodium and chlorine attract the two elements together to form the ionic bond.
Covalent bonds are the kind of bonds formed when two atoms share electrons. Here there is sharing, none of the atoms loses an electron and none gains. A good example is water which is formed when oxygen shares two electrons, each with an atom of hydrogen.
The Oxygen atom forms two covalent bonds with the pair of hydrogen atoms.
He developed and improved the microscope. He was also the first to discover single-cell organisms that he called animalcules.
Answer:
F1) 1/4 = 25% de la porgenie será AB, IAIB
1/4 = 25% de la progenie será heterocigota para el tipo A, IAi
1/4 = 25% de la progenie será heterocigota para el gruo B, IBi
1/4 = 25% de la progenie será homocigota recesiva, ii
Explanation:
- El gen I determina el tipo de sangre de una persona. Es un gen dialelico que muestra alelo dominante I y recesivo I.
- En personas de tipo A, los alelos son IA dominante, i recesivo.
- En personas de tipo B, los alelos son IB dominante, i recesivo
- IA e IB son codomiantes entre si, lo que signofica que hay un tercer fenotypo IAIB, expresando ambos tipos de sangre juntos.
- El alelo i es recesivo siempre.
Genotipo A:
- IAIA, Homocigota dominante
- IAi, Heterocigota
- ii homocigota recesivo
Genotipo B:
- IBIB, Homocigota dominante
- IBi, Heterocigota
- ii homocigota recesivo
Genotipo AB:
- IAIB, Homocigota dominante
Cruza: un hombre que es heterocigoto para el tipo de sangre B con una
mujer que es heterocigota para el tipo de sangre A
Parentales) IBi x IAi
Gametos) IB i IA i
Cuadro de Punnett)
IB i
IA IAIB IAi
i IBi ii
F1) 1/4 = 25% de la porgenie será AB, IAIB
1/4 = 25% de la progenie será heterocigota para el tipo A, IAi
1/4 = 25% de la progenie será heterocigota para el gruo B, IBi
1/4 = 25% de la progenie será homocigota recesiva, ii
