Final Exam- Lecture Chap. 8 Flashcards Preview

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Flashcards in Final Exam- Lecture Chap. 8 Deck (51):
1

A(n) ________ is an example of an organism that can sometimes reproduce asexually by parthenogenesis.

Komodo dragon

2

Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions EXCEPT ________.

production of sperm and eggs

3

The chromosomes of eukaryotic cells are found in the ________.

nucleus

4

Chromatin consists of ________.

DNA and protein

5

A duplicated chromosome consists of two ________.

sister chromatids

6

Sister chromatids are joined at the ________.

centromere

7

Which of the following occurs during interphase?

Chromosome duplication occurs.

8

The mitotic cell cycle results in the production of ________.

two cells, each with the same amount of genetic material and the same genetic information

9

Which of the following occurs during prophase?

The mitotic spindle begins to form.

10

Which of the following is a stage of mitosis?

telophase

11

The CORRECT sequence of stages of mitosis is ________.

prophase, metaphase, anaphase, telophase

12

During metaphase, ________.

chromosomes line up in the middle of the cell

13

Which of these events occurs during anaphase?

Sister chromatids become separate chromosomes.

14

During telophase, ________.

the events of prophase are reversed

15

A cell that completed the cell cycle without undergoing cytokinesis would ________.

have two nuclei

16

Cytokinesis typically begins during the ________ stage of mitosis.

telophase

17

What is the difference between a benign and a malignant tumor?

Benign tumors do not metastasize; malignant tumors do.

18

Which of the following will help prevent cancer and increase survival?

Seek early detection of tumors.

19

) Homologous chromosomes ________.

carry genes controlling the same inherited characteristics

20

What chromosomes belong to a normal human male?

44 autosomes, one X chromosome, and one Y chromosome

21

What chromosomes belong to a normal human female?

44 autosomes and 2 X chromosomes

22

Chromosomes that do NOT determine the sex of an individual are called ________.

autosomes

23

Sexual reproduction in humans ________.

allows a haploid sperm cell to fertilize a haploid egg cell

24

In meiosis, how does prophase I differ from prophase II?

During prophase I there is one diploid cell; during prophase II there are two haploid cells.

25

How much genetic material is present in a cell during prophase I compared to a cell that has completed meiosis II?

four times as much

26

During metaphase I, ________.

homologous chromosomes line up in the middle of the cell

27

Upon completion of telophase I and cytokinesis, there is(are) ________ cell(s).

two haploid

28

Which of the following is a characteristic seen in prophase I that does NOT occur in prophase II?

Crossing over occurs.

29

Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ________ and in mitotic anaphase ________.

the cells are haploid and sister chromatids separate... the cells have the same number of chromosomes as the original cell and sister chromatids separate

30

One difference between mitosis and meiosis is ________.

) mitosis produces cells genetically identical to the parent cell, but meiosis does not

31

Genetic variation is accomplished by all but one of the following. Choose the exception.

the events of meiosis II

32

Which of the following is the best description of the events of anaphase I?

Homologous chromosomes randomly separate and migrate to opposite poles.

33

For a species with four pairs of chromosomes, ________ chromosome combinations are possible.

16

34

Crossing over during prophase I results in ________.

genetic recombination

35

A karyotype (a chromosome display) would be unable to determine ________.

eye color

36

How many chromosomes can a gamete possess as a result of nondisjunction?

n + 1 or n - 1

37

How many chromosomes does an individual with Turner syndrome have?

2n − 1

38

Sexual reproduction appears to be absent in bdelloid rotifers. Which of these, if found in this group, would bring into question the idea that they reproduce ONLY asexually?

cells in which meiosis occurs

39

Which of these describes the type of reproduction that is most adaptive in a rapidly changing environment with many different parasitic diseases present?

sexual reproduction because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment

40

Examine the figure below. Nucleosomes are made of ________.
* strand of DNA, diff levels- swirl down

DNA and histone proteins

41

As shown in the following figure, plant cell cytokinesis differs from animal cell cytokinesis because ________. *** looks like a butt

plant cells form a cell plate and animal cells do not

42

This diagram of the human life cycle shows that ________. +++ Black couple and cycle

meiosis produces haploid sperm and egg cells

43

What is the chromosome number found in humans cells after meiosis I is completed?

22 autosomes and a sex chromosome

44

The above figure shows that ________. ** side ways xmas tree

meiosis results in the formation of four haploid daughter cells

45

The 2n number for the cell depicted here is ________.

two

46

The karyotype above shows ________.
** black square with many pairs of chromosomes

trisomy 21, a cause of Down syndrome

47

Which of these could lead to the mistake evident in the karyotype?

a nondisjunction in meiosis II in gamete formation

48

) Amanda's abnormal number of sex chromosomes resulted from ________.

nondisjunction

49

With respect to her sex chromosomes, Amanda would be designated as ________.

XO

50

) What percentage of Amanda's gametes would likely have the normal number of chromosomes?

50 percent

51

) If only some, but not all, of Amanda's somatic (body) cells had only one X chromosome, this could indicate that an error occurred ________.

during mitosis which occurred at a multicellular stage of Amanda's development