Tuesday, July 19, 2011

Polygenic Inheritence

Polygenic inheritance is when an offspring has traits from both parents but mixed together. For example one parent would be tall and the other might be short so the offspring would be average height. The offspring would be a mixture off the tall gene with the short gene therefore causing it to be in between tall and short. In the picture is my mom, dad, and me and as you can see my dad is tall and my mom is short and I am medium height. This shows I got genes from both of them and the traits mixed so I am now medium height.
polygenic inheritence. (2002). Retrieved from http://staff.jccc.net/pdecell/evolution/polygen.html

Apical Meristems

An apical meristem is a meristem located at the end of a shoot or a root. They help the shoot or the root grow larger. Apical meristems cause primary growth. They also make other kinds of meristems that make primary tissues for the plant. They are important for plant growth and stability, they also help get good nutrients by helping roots grow to reach areas with more water or nutrients. I took a picture of roots because that is where most apical meristems are found.

Apical meristems. (2011).Retrieved from http://www.thefreedictionary.com/apical+meristem

Dicot


Dicots are flowering plants with two cotyledons. Their stems grow from deposits from the outside of the seed. The usual examples are trees and shrubs. Their leaves have netlike veins which causes transfering of nutrients, food and water through a mesh like pattern. A peanut is a dicot seed so i figured it would be a good idea to get a picture of peanuts.
dicotyledon. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/357598/dicotyledon


Aggregate Fruit

Aggregate fruits are fruits that come from a single flower. They come from one flower and form multiple little fruits. For example strawberries have all little fruits that are all together on one big fruit and come from only one flower. This is why I took a picture of strawberries because it seemed like a good example and a person can se by looking at them the little seed loking things are fruits.



Aggregate fruit. (2011 ). Retrieved from http://www.fruitsinfo.com/aggregate-fruit.php

Multiple Fruit

Multiple fruits are actually a single plant that has a bunch of simple fruits coming from their own flower.When all the little fruits mature they all grow together to form one big fruit. Though the flowers do grow into seperate fruits they later form together to form one larger fruit. Pinapples are an example of multiple fruits.

Multiple fruit. (2011 ). Retrieved from http://www.fruitsinfo.com/multiple-fruit.php

Phloem

Phloem are like the Xylem but instead of transfering water and disolved minerals they move sugars, starches and other types of food through the plants to where it is needed to go. Sap that drips from trees usually comes from the phloem. In trees the phloem is the innermost part of the bark, and in maple trees the phloem can help transfer sugars and things so that syrup can be collected from maple trees. This is why i took a picture of the maple syrup bottle.

Phloem. (n.d.). Retrieved from http://www.phloem.org/



Petiole

 The petiole is the stem or stalk that attatches the leaf to the plant, in the picture above the petiole attaches the maple leaf to the branch of the tree. Without a petiole a plant would be sessile, which would mean the flower or leaf would grow right out of the plant with no stem. Some flowering plants can be classified by their petiole.

Petiole. (n.d.). Retrieved from http://www.cactus-art.biz/note-book/Dictionary/Dictionary_P/dictionary_petiole.htm