2. (25 points total) Imagine that you are a Nature Conservancy biologist studyin

Question

2. (25 points total) Imagine that you are a Nature Conservancy biologist studying two populations of redwood sorrel (Oxalis oregana) in the coastal forests near Mendocino, CA. Redwood sorrel is an understory herb adapted for low ight and moist environments. ts leaves are among the favored de licacies of slugs and other forest herbivores. In the two parks you are manitoring, rangers are conducting controlled burns every 5 years to encourage the establishment of coast redwood seedlings. Their relatively cool ground fires kill living O, oregana plants, but not their seeds, which readily germinate on the soil layers exposed by burning Redwood sorrel popu ations are polymorphic far leaf patten: seedlings and adults display ane of two leaf morphs(see table below). Previous genetic work has shown that a single gene (locus with two alleles (La and L) control the leaf polymorphism. You began a study of two populations(Shady woods and Big Timber) just after buns were conducted in 2012. You searched exhaustively through each bum area in December 2012, and new redwood sorrel seedlings were counted and characterized by their leaf patterns. You also conducted genetic work to distinguish between LL, plants and the homozygotes. The 2012 seedling data appear on the tables below (use the dataset for your last name) No mare seedings emerged after 2012, confirming the importance of recent fire to regeneration of this species. Another burn was conducted in October 2017, so you returned to bath sites in September and re-surveyed the surviving redwood sorrel plants from the 2012 cohort, which had recently become reproductively mature and analyzed them genetically. The 2017 survivor data appear on the tables below (use the dataset for yaur last name) Last Name D-L Shady Woods site Big Timber site Genotype Phenotype Seedlings Survivors Seedlings Survivors 017 3912 1306 2012 2012 2017 8041 Striped leaves Blotched leaves Blotched leaves 15 L,4, 969 922 L,4, 61 57 600 7235

Explanation / Answer

Redwood sorrel(Oxalos orefana) is an understory hurb which inhabit in low light and moist environments. It grows mostly in coastal areas. It is grown vast in coastal areas because the leaves of this plants are edible. One of the unique nature if the plant is that the seeds of this plants show resistant to fire but not the the plant. So for the rotation of the plant controled burns are made. The seeds which survive show seedlings and grow into complete plant. The leaf patterns of this plant is polymorphic where the seedlings and adults show one of this two patterns (stripped leaves and blotched leaves). This leaf polymorphism is controlled by a single gene which contains two alleles ( L1 and L2). In my study about two redsorrl observed as (shady woods and big timber) plants were studied. So burns were made in 2012 and searched for seedlings exhaustively and the seeslings were counted and the leaf patterns were characterised. The genetic work also conducted to distinguish the L1 and L2 plants. From the table in 2012 it was observed rhat about 8041 seedlings were observed which is shady woods site with stripped leaves and 31 seedlings of big timber were observed (L1and L2), 1398 seedlings of shady woods site with blotched leavese were observed and 969 of big timber were observed (L1 and L2). 61 seedlings of blot hed leaves of shady woods and 7600 of big timber were observed (L2 and L2). After 2012 the burn was made but there were no emergence of seeslings. Later the burn was made in 2017 and the seeslings were counted. It was found thasurvived.3912 shady woods site plants with striped leaves were survived and 15 big timber were survived(L1 and L1). About 1306 shady woods and 922 big timber with blotched leaves (L1and L2 ) were survived. About 57 shady leaves and 7235 big timber with blotched leaves(L2andL2) were survived. By this we found that shady woods site plants with striped leaves were survived more than the blotched leaves and became reproductively mature andamong the blotched leaves of shady woods that is between (L1L2) and (L2L2) the L1L2 shown more reproductivity. In case of big timber site plant blotched leaves with L2L2 type shown reproductivity than other. Between striped and blotched (L1L2) leaves, the blotched leaves shown more reproductivity and survival.

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