Frogs have 13 pairs of chromosomes. complete this model by writing in the correct number of chromosomes for the sperm, egg, and fertilized egg of a frog. then write in the type of cell division taking place in the two phases shown in the model.
the model shows:
1. type of cell
2. how many sperm
3. how many egg
4. how many fertilized egg
5. cell division for

Need the diagram below, which is not drawn to scale, shows the position of the earth, moon, and sun. what type of eclipse occurs when the earth, moon, and sun are lined up in the order shown? a. planetary eclipse b. solar eclipse c. martian eclipse d. lunar eclipse

20 the main source of energy for our planet comes from the

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.