You study a small population of birds on one very isolated island and notice that the frequency of individuals with a green band on their wings increases over the course of 3 years. The green band appears heritable (offspring resemble parents), but, despite extensive experiments, you cannot identify any selective advantage of the green band. What would an evolutionary biologist be MOST likely to conclude?

A. The change in frequency of the band is most likely due to genetic drift.
B. This is not an evolutionary change because the increasing frequency of green bands is not due to natural selection.
C. The presence or absence of the green band is probably due to environmental rather than genetic differences.
D. There must be some as yet undetermined advantage to having the band to account for its increase in frequency.
E. Mutations causing the green band have increased in frequency over the past 3 years.
F. Gene flow from a mainland population is responsible for the appearance of the green band in the island population.

i'd say that the moon rock is about 2.2 billion years old.

yes!

explanation:

because it has a type of fat that can make you extremely sick

nucleus

would be most reasonable answer tbh

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.