bicd130_06_lecture3r

bicd130_06_lecture3r - BICD 130 Embryos, Genes, and...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: BICD 130 Embryos, Genes, and Development Amount and distribution of yolk influences cleavage pattern holoblastic (isolecithal, mesolecithal): cleavage furrow extends through entire egg meroblastic (telolecithal, centrolecithal): cleavage furrow excluded from yolky part of cytoplasm Amount and distribution of yolk influences cleavage pattern Radial holoblastic cleavage in the sea urchin Meridional (= parallel) Equatorial (= perpendicular) Radial holoblastic cleavage in the sea urchin blastula: hollow ball of cells at the end of cleavage blastocoel: central fluid-filled cavity in blastula Amount and distribution of yolk influences cleavage pattern Spiral holoblastic cleavage in a mollusc Spiral holoblastic cleavage in a mollusc Orientation of mitotic spindle at second cleavage determines the direction of snail shell coiling Maternal genotype controls the direction of shell coiling in the snail Limnaea peregra (Sturtevant) Parental Genotypes (female X male) DD X dd dd X DD Dd X Dd Progeny Genotype Phenotype Dd Dd 1DD:2Dd:1dd All right All left All right Amount and distribution of yolk influences cleavage pattern (ascidians, sea squirts) Larval form of ascidian (sea squirt) Bilateral holoblastic cleavage in an ascidian Amount and distribution of yolk influences cleavage pattern Movement and development of the human embryo from fertilization to implantation Rotational holoblastic cleavage in mammals Compaction of 8-cell mouse embryo (formation of tight junctions) Morphological changes during cleavage of the mammalian embryo Movement and development of the human embryo from fertilization to implantation Amount and distribution of yolk influences cleavage pattern Displaced radial holoblastic cleavage in an amphibian Displaced radial holoblastic cleavage in an amphibian Amount and distribution of yolk influences cleavage pattern Discoidal meroblastic cleavage in the zebrafish embryo BD = blastodisc Discoidal meroblastic cleavage in the chick embryo Discoidal meroblastic cleavage in the chick embryo Discoidal meroblastic cleavage in the chick embryo Discoidal meroblastic cleavage in the chick embryo Comparison of the blastula stage in various embryos Amount and distribution of yolk influences cleavage pattern Syncytial early cleavage in an insect embryo (Drosophila) pole cells blastoderm Superficial cleavage in an insect embryo syncytial blastoderm cellular blastoderm ...
View Full Document

Ask a homework question - tutors are online