BIO 121 Lecture Notes - Lecture 3: Metaphase, Heredity, Pangenesis
8 Dec 2020
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Same design, light must pass through blood vessels to reach photoreceptors. Physiological blind spots (scotoma): corresponds to visual field for which retina doesn"t have photoreceptors because optic nerves must pass through. All mammals have scotoma; cephalopods (octopus) don"t. Chromosome: linear molecule of dna, invisible during (interphase) Visible in some organisms in some tissues. Dna replication, cell division, growth and development. Diploid throughout, daughter cells are exact copies of the original cell. Prophase, metaphase, anaphase, telophase (2n)-replication-(4n)-cell division- 2 cell, each (2n) (2n)-replicates-(4n)- 4 haploid cells (n) Dna replication, cell division, during gamete production. Crossing over prophase i independent assortment: decides to spread the chromosomes to separate poles. Gene is any inherited genetic material; or addresses in the genome of a species, a locus usually containing a transcription unit transcribed to rna, then to protein. Alleles are alternative forms of the same gene. Each diploid has one allele of each locus from the parent.
