Multiple Choice Quizzes - Life Sciences

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Question 1

Which of the following statements is true:

	A.	The dominant allele is masked in homozygous dominant individuals.
	B.	With dominant genetic disorders, the mother and/or father of an affected individual must also be affected.
	C.	With recessive genetic disorders, if both parents are carriers, the offspring will all be affected.
	D.	In recessive genetic disorders, the mother and/or father of an affected individual must also be affected.
	E.	In carriers, the recessive allele causes an intermediate phenotype.

5 points

Question 2

Sickle cell anemia is an example of what type of inheritance?

	A.	codominance
	B.	incomplete dominance
	C.	complete dominance
	D.	recessive dominance
	E.	multiple alleles

5 points

Question 3

Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents that produced these plants?

	A.	ttGG x TTgg
	B.	None of the above
	C.	TtGg x TtGg
	D.	TtGg x Ttgg
	E.	TtGg x ttgg

5 points

Question 4

Consider two traits for an organism, determined by two genes, each of which is governed by at least two alleles. In the case of a dihybrid individual, the gametes formed will be of either the parental type or the recombinant type. Recombinant type gametes are formed because of

	A.	incomplete dominance.
	B.	the principle of dihybrids.
	C.	heterozygosity.
	D.	independent assortment.
	E.	multiple alleles.

5 points

Question 5

If an organism’s diploid chromosome number is 18, how many different possible combinations of homologous chromosomes lining up during meiosis exist for the eggs or sperm produced by that organism?

	A.	36
	B.	128
	C.	9
	D.	512
	E.	18

5 points

Question 6

Skin cancers typically develop in the

	A.	subcutaneous layer.
	B.	lower layers of the epidermis.
	C.	upper layers of the dermis.
	D.	upper layers of the epidermis.
	E.	lower layers of the dermis.

5 points

Question 7

The segregation principle states that in sexually reproducing diploid organisms the two copies of each gene

	A.	must always be the same allele.
	B.	separate from each other during mitosis.
	C.	move together as a unit during meiosis.
	D.	will both wind up in either the sperm or egg.
	E.	segregate from each other during meiosis.

5 points

Question 8

After the DNA is replicated, and it condenses in prophase, two identical rods of DNA are seen. These are

	A.	kinetochores.
	B.	spindle fibers.
	C.	chromatids.
	D.	chromatin.
	E.	centromeres.

5 points

Question 9

If you view a cell in which the genetic material is beginning to be visible as separate bodies, and the nucleus has disappeared from view, you may surmise that the cells is in

	A.	metaphase.
	B.	telophase.
	C.	prophase.
	D.	interphase.
	E.	anaphase.

5 points

Question 10

In what phases is the genetic material in the cell correctly referred to as chromatids?

	A.	anaphase and metaphase
	B.	interphase and prophase
	C.	interphase and telophase
	D.	metaphase and prophase
	E.	metaphase and telophase

5 points

Question 11

What structure holds the sister chromatids to the spindle fibers?

	A.	cyclin
	B.	chromatin
	C.	kinetochore
	D.	MPF
	E.	centromere

5 points

Question 12

The genetic makeup of a particular trait in an individual is its

	A.	phenotype.
	B.	genotype.
	C.	filial.
	D.	heterozygosity.
	E.	dominance.

5 points

Question 13

Special cells found in the gonads that give rise to gametes upon division are called

	A.	egg cells.
	B.	germ cells.
	C.	somatic cells.
	D.	stem cells.
	E.	basal cells.

5 points

Question 14

An allele is

	A.	always recessive.
	B.	the dominant form of a gene.
	C.	the main factor determining a trait.
	D.	always one of a pair.
	E.	an alternate form of a gene.

5 points

Question 15

Mendel observed that dominant traits

	A.	were the only traits seen in the F2 generation of pea plants in his experiments.
	B.	are only expressed in hybrids.
	C.	were absent in the F1 generation of pea plants that he used in his experiments.
	D.	are expressed in all plants.
	E.	are seen in all of the F1 hybrid pea plants in his experiments.

5 points

Question 16

Gregor Mendel was successful in his analysis of the genetics of pea plants because

	A.	pea plants have genetics different from other organisms.
	B.	he decided to only look at his results in an objective manner.
	C.	he examined and analyzed both the F1 and F2 generations.
	D.	he studied a trait that had a strange inheritance pattern.
	E.	he studied the parental plants to determine their differences.

5 points

Question 17

At the end of metaphase I, _______________ separate.

	A.	germ cells
	B.	sister chromatids
	C.	homologous chromosomes
	D.	centrioles
	E.	haploid chromatids

5 points

Question 18

Duchenne muscular dystrophy (MD) is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father?

	A.	1/4
	B.	1/2
	C.	0
	D.	1/8
	E.	1/16

5 points

Question 19

Cytokinesis in plant cells differs from cytokinesis in animal cells because

	A.	the contractile protein, actin, is important only in plant cells.
	B.	in plant cells, the cell plate must also divide into two parts.
	C.	plant cells have a rigid cell wall.
	D.	a contractile ring forms only in plant cells.
	E.	there is no difference.

5 points

Question 20

In humans, a gene that has been identified as causing a type of skin cancer is the

	A.	mutant superman.
	B.	superwoman echidna.
	C.	mutant mole rat.
	D.	sonic hedgehog.
	E.	superhero aardvark.