If a population of medium sized rodents is placed under a selective pressure that yields both very large and very small individuals it was most likely a. a stabilizing selection b. a disruptive selection c. a directional selection d. not a natural selection event *not d

Option b , disruptive selection

Explanation:

Let’s define all the terms given in the option –

a)Stabilizing selection – The average trait is expressed more commonly in a given set of population. For example if there are some dogs of black color and some are of white color , the population of dogs after sometime will have grey color dogs instead of having extreme black and white color dogs.  

b)Directional selection – Here the trait is expressed towards any one of the extreme limit. For example – Out of the black and white dogs,  the population of dogs after sometime will consists of either a black dogs or a white dogs.  

c)Disruptive selection – When only the extreme traits are expressed. For example – Out of the black and white dogs, the population of dogs after sometime will have only black dogs and white dogs and no  dog of any color in between black and white

Thus, option b is correct

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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.