Galactosemia is a recessive human disease that is treatable by restricting lactose and glucose in the diet. susan smithers and her husband are both heterozygous for the galactosemia gene. if susan and her husband have four children, what is the probability that: (1 point each)

There are 3 exclusive mutually birth orders that could

make two affecteds and 1 unaffected - unaffected child first born, unaffected child

second born, and unaffected child third born. Thus, there is a 3/64 + 3/64 + 3/64

= 9/64 chance that 2 out of 3 children will be affected.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.