Genetics LS 4 Test Review

sandwichtumtumBiotechnologie

16 déc. 2012 (il y a 4 années et 10 mois)

202 vue(s)


Genetics LS 4
T
est Review

Definitions


Nucleus: control center of the cell contains
the DNA


DNA: the genetic information of the cell


Zygote: a fertilized egg


Genetic engineering: changing the genes of
an organism


Theory: scientific explanation that is strongly
supported by a variety of experimental data

Define and Compare

Mitosis


Meiosis


Number of daughter
cells produced

2

4

Is the daughter cell
identical or different
from the parent cell?

Identical

different

Number of
chromosomes in
daughter compared to
parent

same

1/2

Purpose

Growth

Repair

Reproduction

Which of these processes along with fertilization account for the great amount of trait
variation among individuals in a population?

Meiosis


4. A dog has 78 chromosomes in a
body cell. Complete the chart

Cell Type

Number of
Chromosomes

Egg

39

Sperm

39

Zygote

78

Describe the relationship between a
tumor, mitosis and cancer.



Mitosis
is cell division.
Cancer

is uncontrolled
cell vision that results in the formation of a
mass of abnormal cells called a
tumor
.

6
. Although identical twins have identical
DNA, as they age become more different in
health and appearance. What causes this
change?


The environment can cause the identical
twins to become more different as they age.

7. List the genotype for a human male and
human female. In humans which parents
determine the sex of the offspring?


Male = XY


Female = XX


The male determine the sex of the offspring
in humans.

8. List the pros and cons of asexual
reproduction.


Pros


Requires only one parent


Occurs very quickly


Cons


Offspring inherits both strengths and weaknesses
from parent

Sketch the structure of a DNA molecule. Be sure
to include the matching DNA bases


DNA:
double helix
structure.


Made up of
4 bases
(A,T,C and G)

Think about what a scientist can
learn from the genome of the DNA.
What are some concerns that
might arise from having this
information in your medical
records?

Scientists


Friedrich Miescher:


Discovered “nuclein” in bandages


Rosalind Franklin:


Used X rays to identify changes in DNA but never
saw DNA itself


Linus Pauling


discovered structures of molecules that led to
discovery of DNA structure


Crick, Watson and Wilkins


Discovered structure and made model of DNA
molecules