Question

1. The “silencing” of certain human genes by DNA methylation during gametogenesis (male or female) results in a phenomenon known as:

a.   sex linkage.

b.   the Barr phenomenon.

c.   sex limitation.

d.   genetic/genomic imprinting.

e.   linkage.

                 

2. Continuous (quantitative) variation in the expressed phenotype of a character most often indicates/suggest that a ____ pattern of inheritance is involved.
   1. pleiotropic (pleiotrophy)
   2. polygenic
   3. co-dominant
   4. incompletely dominant
   5. epistatic (epistasis)

3. Aneuploid cells are almost always created as a result of:

1. unequal crossing over.
2. translocations.
3. Nondisjunction during mitosis or meiosis.
4. DNA replication without cell division.
5. chromosomal deletion.

4. Signal molecules involved in localized communication in plants often move from cell to cell by:
   1. passing through membrane-associated receptors.
   2. gap junctions.
   3. plasmodesmata
   4. highly specific ion channels.
   5. stomata.

5. The first map showing the order and relative distances of separation for genes/loci all found on the same chromosome was produced by:

a.   Mendel.

b.   Thomas Morgan.

c.   Emil Krebs.

d.   Walther Flemming.

e.   Alfred Sturtevant.

6. The molecular motor that powers the chromosome/chromatid down the spindle fiber is found in the:
   1. centromere.
   2. centrosome.
   3. telomere.
   4. kinetochore.
   5. aster.

Answer 1

answer 1

option no d is correct

which state that the The “silencing” of certain human genes by DNA methylation during gametogenesis (male or female) results in a phenomenon known gene imprinting .

answer 2

option no b is correct

which state that the Continuous (quantitative) variation in the expressed phenotype of a character most often indicates/suggest that a POLYGENIC pattern of inheritance is involved.

answer 3

option no c is correct

as we know that the aneuploidy  occurs during cell division when the chromosomes do not separate properly between the two cells (nondisjunction).

answer 4

option no c is correct

which state that the Plasmodesmata  interconnect cells and form an intercellular communication network in the plants

answer 5

option no e is correct

the Alfred Sturtevant mapped  the relative location of a series of genes on a chromosome

answer 6

option no d is correct

which state that the molecular motor that powers the chromosome/chromatid down the spindle fiber is found in the kinetochore