FREE BIOLOGY AND STUDY GAMES ABOUT

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FREE BIOLOGY AND STUDY GAMES ABOUT

BIOLOGYCH13CAMPBELL EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -49 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: In a diploid set of chromosomes, 1 member of each pair of homologous chromosomes is derived from thepaternal, and the other comes from the maternal. If 2n=6, what is the probability of obtaining a gamete in which all the chromosomes are paternal ones?

Answer:

1/8 Question 2: Although _____ is nearly universal among animals, bdelloid rotifers _____.

Answer:

sexual reproduction ... reproduce asexually but can increase genetic variation present in a population by means of the uptake of DNA from other rotifers

Question 3: How many pairs of autosomes do humans have?

Answer:

22

Question 4: Which of the following results in cells that contain half the parental chromosome number?

Answer:

meiosis

Question 5: Sister chromatids _____.

Answer:

are identical copies of each other formed during DNA synthesis

Question 6: Cytokinesis is the _____.

Answer:

division of one cell into two

Question 7: What is the result when a diploid cell undergoes meiosis?

Answer:

four haploid cells

Question 8: A clone is the product of _____.

Answer:

asexual reproduction

mitosis

Question 9: How many genes are present in the human genome?

Answer:

tens of thousands Question 10: In a male mammal, every cell that undergoes meiosis gives rise to _____ sperm.

Answer:

four

Question 11: A karyotype is _____.

Answer:

a photograph of all of an individual's chromosomes

Correct. Karyotypes, ordered displays of an individual's chromosomes, are useful in identifying chromosomal abnormalities.

Question 12: The egg (ovum) of a rabbit contains 22 chromosomes. How many chromosomes are in the somatic (body) cells of a rabbit?

Answer:

44

Correct. Haploid sex cells contain half as many chromosomes as diploid somatic cells.

Question 13: What is a locus?

Answer:

the precise location of a gene on a chromosome Question 14: In a diploid cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.

Answer:

5

Correct. Haploid sex cells contain half as many chromosomes as diploid somatic cells.Question 15: Which of the following statements about homologous chromosomes is correct?

Answer:

They have genes for the same traits at the same loci.

Question 16: Sexual and asexual reproduction are alike in that _____.

Answer:

they can both occur in multicellular organisms Question 17: Which event occurs only during prophase I of the first meiotic division?

Answer:

Synapsis of homologous pairs occurs Question 18: Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid number of 8?

Answer:

16

Correct. The number of combinations possible when chromosomes assort independently into gametes during meiosis is 2n, where n is the haploid number of chromosomes.

Question 19: Regions of chromosomes where nonsister chromatids cross over are called _____.

Answer:

chiasmata

Question 20: Which of the following occurs during anaphase I?

Answer:

Homologs separate and migrate toward opposite poles.

Question 21: Spores and gametes are different in that _____.

Answer:

gametes can fuse to form a zygote, but spores can develop into independent organisms without first forming a zygote

Correct. Unlike a gamete, a spore gives rise to a multicellular organism without fusing with another cell.Question 22: Unless the chromosomes were stained to show band patterns, a karyotype would be least likely to show which of the following?

Answer:

part of a chromosome turned around

Correct. An inversion, which affects neither the number of chromosomes nor the length of a chromosome, is generally difficult to detect without staining to show chromosomal bands.Question 23: Which of the following contributes to genetic variation in sexually reproducing species?

Answer:

random fertilization, independent assortment, crossing over

Question 24: Synapsis occurs during _____.

Answer:

prophase I

Question 25: Crossing over occurs during _____.

Answer:

prophase I

Correct. Crossing over resulting in genetic recombination occurs during this phase.