100% A+ GS102 Week 3 Test

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

2.  

   A.

   multiple alleles

   B.

   complete dominance

   C.

   recessive dominance

   D.

   codominance

   E.

   incomplete dominance

Question 2

1. 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.

   interphase.

   B.

   prophase.

   C.

   metaphase.

   D.

   anaphase.

   E.

   telophase.

    

Question 3

1. Which of the following statements is true:

    

   A.

   In recessive genetic disorders, the mother and/or father of an affected individual must also be affected.

   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 carriers, the recessive allele causes an intermediate phenotype.

   E.

   The dominant allele is masked in homozygous dominant individuals.

    

Question 4

1. What structure holds the sister chromatids to the spindle fibers?

    

   A.

   centromere

   B.

   chromatin

   C.

   cyclin

   D.

   MPF

   E.

   kinetochore

    

Question 5

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

    

   A.

   sonic hedgehog.

   B.

   mutant superman.

   C.

   mutant mole rat.

   D.

   superwoman echidna.

   E.

   superhero aardvark.

    

Question 6

1. Mendel observed that dominant traits

    

   A.

   were absent in the F1 generation of pea plants that he used in his experiments.

   B.

   were the only traits seen in the F2 generation of pea plants in his experiments.

   C.

   are only expressed in hybrids.

   D.

   are seen in all of the F1 hybrid pea plants in his experiments.

   E.

   are expressed in all plants.

    

Question 7

1. At the end of metaphase I, _______________ separate.

    

   A.

   homologous chromosomes

   B.

   centrioles

   C.

   haploid chromatids

   D.

   sister chromatids

   E.

   germ cells

    

Question 8

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

    

   A.

   he decided to only look at his results in an objective manner.

   B.

   pea plants have genetics different from other organisms.

   C.

   he studied a trait that had a strange inheritance pattern.

   D.

   he studied the parental plants to determine their differences.

   E.

   he examined and analyzed both the F1 and F2 generations.

    

Question 9

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

    

   A.

   kinetochores.

   B.

   chromatids.

   C.

   spindle fibers.

   D.

   centromeres.

   E.

   chromatin.

    

Question 10

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

    

   A.

   stem cells.

   B.

   somatic cells.

   C.

   basal cells.

   D.

   germ cells.

   E.

   egg cells.

    

Question 11

1. Skin cancers typically develop in the

    

   A.

   upper layers of the dermis.

   B.

   lower layers of the epidermis.

   C.

   upper layers of the epidermis.

   D.

   subcutaneous layer.

   E.

   lower layers of the dermis.

    

Question 12

1. An allele is

    

   A.

   the main factor determining a trait.

   B.

   an alternate form of a gene.

   C.

   the dominant form of a gene.

   D.

   always one of a pair.

   E.

   always recessive.

    

Question 13

1. 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.

   the principle of dihybrids.

   B.

   independent assortment.

   C.

   incomplete dominance.

   D.

   multiple alleles.

   E.

   heterozygosity.

    

Question 14

1. 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.

   1/8

   B.

   1/16

   C.

   1/2

   D.

   1/4

   E.

   0

    

Question 15

1. 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.

   ttGG x TTgg

   C.

   TtGg x ttgg

   D.

   TtGg x TtGg

   E.

   None of the above

    

Question 16

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

    

   A.

   metaphase and telophase

   B.

   interphase and prophase

   C.

   anaphase and metaphase

   D.

   metaphase and prophase

   E.

   interphase and telophase

    

Question 17

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

    

   A.

   move together as a unit during meiosis.

   B.

   segregate from each other during meiosis.

   C.

   will both wind up in either the sperm or egg.

   D.

   must always be the same allele.

   E.

   separate from each other during mitosis.

    

Question 18

1. 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.

   9

   B.

   128

   C.

   512

   D.

   18

   E.

   36

    

Question 19

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

    

   A.

   heterozygosity.

   B.

   genotype.

   C.

   dominance.

   D.

   filial.

   E.

   phenotype.