Would you expect plants that normally live in the desert to exhibit more pronounced phototropism than forest dwelling plants? explain.

Tropism can be defined as a stimulant, with respect to it plant respond to it's external environment. Tropism includes light, water, touch and gravity. The phototropism refers to the movement of plant with respect to the light stimulus. Shoot or stem part of the plant shows positive phototropism because it grows and move in the direction of sunlight, whereas the root shows negative phototropism as it grows against the sunlight.

Yes, plants that live in the desert are expected to show more pronounced phototropism than the forest dwelling plants.This is  because in a desert habitat the tree population is expected to be limited, and the plants are directly exposed to sun. The stem or shoot will be erect. But in forest dwelling plants the plants will be growing in shade of trees, will receive very low amount of sunlight. The shoots may not be erect, instead will be tilted. Hence, in desert plants the phototropism will be more prominent.  

i thinking chemical change

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.