Key definitions Diploid-dominant life style - the multicellular diploid stage is the most obvious life stage in a diploid-
dominant life cycle, and the only haploid cells are the gametes. Most animals, including people, have this type
of life cycle
Haploid-dominant life style - the multicellular (or occasionally unicellular) haploid stage is the most
noticeable life stage and is frequently multicellular in a haploid-dominant life cycle
Alternation of generations - alternation between an organism's sexual and asexual phases of development
Gametophytes - the sexual stage of plants, certain algae, and the alternation of generations
Sporophyte - the diploid multicellular organism or generation of a plant that develops from a diploid zygote
and produces haploid spores by meiotic division
Meiosis - the presentation of something with little emphasis, especially to get a bigger impact
Synapsis - first meiotic prophase's distinctive attachment of homologous chromosomes
Crossing over - gene or fragment exchange between homologous chromosomes
Chiasmata - the chromosomes' homologous pair's point of interaction
Tetrads - a quartet of cells created from the repeated divisions of a mother cell
Recombinant - having or referring to genetically modified DNA
Interkinesis - the time frame between a nucleus's two mitoses (as between the first and second meiotic
divisions)
Exercise 1 : In two or three sentences, respond to the following questions.
1. What are casparian strips referred to as?
2. What are passage cells, exactly?
3. What is a rhizodermis, exactly?
