Question 1

In an organism with a haploid chromosome number of 16, how many tetrads would be expected in a single cell of this organism at the prophase I of meiosis?

Accepted Answer

16

Question 2

An Oodi has 12 chromosomes. How many pairs of homologous chromosomes would be found in the original primary oocyte?

Accepted Answer

6

Question 3

A biologist examines a series of cells and counts 135 cells in interphase, 20 cells in prophase, 4 cells in prometaphase, 3 cells in metaphase, 5 cells in anaphase, and 3 cells in telophase. If the complete cell cycle requires 24 hours, what is the estimated duration in hours of prometaphase in these cells?

Accepted Answer

$$0.79$$ hrs

Question 4

Which term is given to the theory which states that the gamete contains a complete miniature adult?

Accepted Answer

Preformation

Question 5

Genetics is defined as the branch of biology associated with ________.

Accepted Answer

heredity and variation

Question 6

If a mosquito cell in G1 contains $$3.0 	imes 10$$^{-12}$$ g of DNA, and nuclear DNA essentially doubles during the S phase of interphase, how much nuclear DNA would be present in a cell at the end of meiosis? Note: Assume that the G1 nucleus of a mosquito cell contains 3.0$$ 	imes $$10^{-12} g of $$DNA.

Accepted Answer

$$1.5 	imes 10$$^{-12}$$ g

Question 7

Which of the following is true about the second meiotic division?

Accepted Answer

Sister chromatids are separated at opposite poles.

Question 8

A haploid cell ________.

Accepted Answer

has only one complete set of chromosomes

Question 9

If two parents, both heterozygous carriers of the autosomal recessive gene causing cystic fibrosis, have 7 children, what is the probability that exactly three have cystic fibrosis?

Accepted Answer

$$0.26$$

Question 10

Which protein directly holds the chromatids arms together prior to anaphase of mitosis?

Accepted Answer

Cohesin

Question 11

If 20 percent of the nitrogenous bases in a sample of DNA from a particular organism is thymine, what percentage should be cytosine?

Accepted Answer

30 percent

Question 12

During meiosis, chromosome number reduction takes place in ________.

Accepted Answer

anaphase I

Question 13

Which of the following processes describes the formation of a complementary RNA molecule?

Accepted Answer

Transcription

Question 14

A Mendelian test cross is used to determine whether:

Accepted Answer

an individual is homozygous or heterozygous

Question 15

Which of the following is NOT a function of centromeres?

Accepted Answer

They encode for proteins that hold chromatids together

Question 16

If a diploid human cell contains 46 chromosomes, how many chromosomes would be expected in the single spermatogonium of the organism?

Accepted Answer

46

Question 17

Which of the following best describes the law of independent assortment?

Accepted Answer

During gamete formation, allele pairs are separated to form haploid gametes

Question 18

What is the probability that, in an organism with a haploid number of 15, a sperm will be formed that contains all 15 chromosomes whose centromeres were derived from maternal homologs?

Accepted Answer

$$3.05 	imes 10$$^{-5}$$

Question 19

Which of the following terms accurately describes DNA as it is generally viewed to exist in prokaryotes and eukaryotes?

Accepted Answer

Double-stranded, antiparallel, A + T/G + C = variable, A + G/C + T = 1.0

Question 20

Which stage of cell division do sister chromatids go to opposite poles?

Accepted Answer

Anaphase II

Genetics: Core Principles, Mendelian Inheritance, and Chromosome Behavior

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