Biology Questions

9. When a sudden change in the environment, such as a flood or fire, reduces the size of a population, thesurvivors' collective gene pool will be only a limited representation of what was present before the disaster. Thisphenomenon is called the:A) Hardy-Weinberg effect.B) the founder effect.C) bottleneck effect.D) culling effect.E) genetic load.

15. In a given population, a few individuals may, by random chance, leave behind more descendants than otherindividuals. Thus, the next generation will have a higher proportion of the alleles of the "lucky" individuals. Whichconcept is illustrated by this example?A) migrationB) mutationC) the founder effectD) the bottleneck effectE) genetic drift

31. Which statement describes disruptive selection?A) A cattle breeder selects the largest male calf to be the sire for his next herd.B) Coho salmon eggs tend to be fertilized by the smallest or largest males.C) Female starlings that lay four or five eggs per clutch have more surviving young than those with larger or smallerclutches.D) The most common color form of an insect experiences the heaviest predation.E) Female long-tailed widowbirds prefer males with the longest tails.

5. Evolution is defined as:A) survival of the fittest.B) a change in the frequency of a physical trait in a population over time.C) a progressive "ladder" of changes from the most primitive organisms to the most advanced organisms.D) a change in a physical trait of an individual during its lifetime.E) a change in the frequency of alleles in a population over time.

the recessive allele for having no freckles could be represented as

the allele of a gene that is represented with an uppercase letter is the

fetal development occurs during which time frame after fertilization

if you received a recessive allele from your father and a recessive allele from your mother your genotype for the trait would be

a pregnancy in which the embryo implants in a location other than the uterus is called a ________ pregnancy

the inner cell mass will eventually become the

which of the following occurs predominantly during the 8th and 9th months of development

the specific genes of combination of alleles for a trait is called an individuals

If born early, what is the earliest stage of development that a fetus would have a good chance of survival?

during the earliest stage of human development, the zygote divides without increasing in size; a process called

alternate forms of a gene are called

If a fetus is covered by lanugo, approximately how old is this fetus?

an individual that inherits two copies of the same form of a gene from his or her two parents has a

how long after fertilization does an embryo typically begin implanting into the wall of the uterus

If the cells of the morula or the inner cell mass split, what type of twins will develop?

during a vaginal delivery the vaginal orifice is often cut to enlarge the opening in a procedure called a