Amother who is a carrier of sickle cell produces a child with a father who is also has sickle cell. whats the genotype of the mother?

The (blank) states that all loving things are made of cells.

Why should organisms reproduce more offspring than will survive? select all that apply.

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.