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chromatin fiber include

DNA and protien

a nucleosome consists of

DNA and histones

the S phase refers to

dna synthesis during interphase

at which of the following stages do human skin cell nuclei have the same DNA content

g1 and late mitotic telophase

each chromosome consists of a pair of attached chromatids in a cell at

mitotic phase, meiotic prophase 2,meiotic prophase 1, and meiotic anaphase 1.

a molecular tether that links sister chromatids of a duplicated chromasome to each other is


in an animal cell at meiotic metaphase, you would expect to find

a pair of centrioles within each microtubule organizing center

in the spindle, the ________ ends of kinetochore microtubules are embedded in the kinetochore, and the ______ ends are at the spindle pole.


cell plate formation usually begins during

telophase in a plant cell

a particular plant species has a diploid chromosome number of 20. a haploid cell of that species at mitotic prophase contains a total of how many chromosomes and chromatids?


a diploid nucleus at early mitotic prophase has_____ set(S) of chromosomes; a diploid nucleus at mitotic telophase has ____ set(s) of chromosomes


the life cycle of a sexually reproducing organism includes

mitosis, meiosis, and fusion of sex cells

which of the following are genetically identical?

2 cells resulting from a mitotic division

you would expect to find a synaptonemal complex in a cell at

meiotic prophase 1

a chiasma links a pair of

homologous chromosomes at late prophase 1

the reason mendel discovered the basic principle of inheritance is that he

began by establishing true-breeding lines

one of the autosomal loci controlling eye color in fruit flies has two alles, one for brown and the other for red. fruit flies from a true breeding line with brown eyes were crossed with flies from a true breeding line with red eyes.the
f1 flies had red eyes. what conclusions can be drawn from this experiment?

The Allele for red eyes is dominant over the allele for brown

the F1 flies were mated with brown eyed flies from a true breeding line. what phenotypes would you expect the offspring to have?

half red and half brown eyes

test cross

between an individual of unknown genotype and a homozygous recessive individual.

the phenotypes of parental(P) generation are

RRyy and rrYY

what are the expected genotypes of the F1 hybrids produced by the described cross

all RrYy

what kinds of gametes can the F1 individual produce?

RY,Ry,rY, and ry

individuals of genotype AaBb were crossed with aabb. approximately equal numbers of the following classes of offspring were produced: AaBb Aabb, aaBb, and aabb. these results illustrate mendels principles

independent assortment and segregation

when homozygous, a particular allele of a locus in rats causes abnormalities in the cartilage throughout the body, an enlarged heart, slow development, and death. this is an example of


in peas yellow seed color is dominant to green. determine the phenotypes (and their proportions) of the offspring of the following crosses. A) homozygous yellow green,B) heterozygous yellow green,C) heterozygous yellow homozygous yellow,D) hetero yellow hetero yellow.

A. all yellow
B. 1/2 yellow 1/2 green
C.all yellow
D. 3/4 yellow 1/4 green

if two animals heterozygous for aa single pair of alleles are mated and have 200 offspring, about how many would be expected to have the phenotype of the dominate allele (that is to look like the parents)


when two long winged flies were mated, the offspring included 77 with long wings and 24 with short wings. is the short winged condition dominant or recessive? what are the genotypes of the parents.

short winged condition is recessive, both parents are heterozygous.

outline a breeding proceedure where by a true breed strain of red cattle could be established from a roan bull and a white cow

repeating matings of the roan bull and the white cow will yeild an approximate 1:1 ratio of roan to white offspring repeating matings among roan offspring will yeild red, roan, and white in approximated 1:2:1 ratio. the mating of two red individuals will yeild only red offspring.

what is the probability of rolling a seven with a pair of dice? which is a more likely outcome, rolling a six or eight?

there are 36 possible outcomes when a pair of dice are rolled.there are six ways of obtaining a seven, five ways of rolling a six, and five of rolling an eight.

In rabbits, spotted coats (S) is dominant to solid color(s) and black(B) is dominant to brown(b). these loci are not linked. a brown, spotted rabbit from a pure line is mated to a solid black, also from a pure line. what are the genotypes of the parents? what would be the genotype and phenotype of an f1 rabbit? what would be the expected geno and phenotypes of the f2 generation?

the genotype of the brown spotted rabbit is bbSS. the genotype of the black solid rabbit is BBss. an f1 rabbit would be black,spotted BbSs. the f2 is expected to be 9/16 black, spotted B_S_ ,3/16 black, solid B_ss, 3/16 brown,spotted bbS_, and 1/16 brown,solid bbss.

mr and mrs smith are concerned because thier own blood types are A and B, respectively, but thier son richard is blood type O. could richard be the child of these parents?


the expression of an allele called frizzle and fowl causes abnormalities of the feathers. as a consequence, the animals body temp is lowered, adversly affecting many functions of the internal organs. when one gene affects the traits of an organism, we say that gene is...


when griffith injected mice with a combination of live rough-strain and heat-killed smooth-strain pneumocci, he discovered that

the dead mice contained living smooth-strain bacteria.

which of the following inspired avery and his coleges to perform the experiments demonstating that the transforming principle in bacteria is dna?

griffiths experiment on smooth and rough strains of pneumocci

in the Hershey-Chase experiment with bacteriophages

viral dna was shown to enter bacterial cells and cause the production of new viruses within the bacteria

the 2 complementary strand of the dna double helix are held to one another by..

hydrogen bond between nucleotide basis

if a segment of dna is 5'-CATTAC-3', the complementary dna strand is...


each dna strand has a back bone that consist of alternating...

deoxyribose and phosphate

the experiments in which Meselson and Stahl grew bacteria in heavy nitrogen conclusivelsy demonstrated that dna...

replicated semi conservitively

the staement "dna replicates by a semi conservitive mechanism" means that...

each double helix consists of one old and one newly senthsized strand.

what technique did franklin use to determine the physical characteristics of dna?

x ray diffraction

mult origins of replication...

speed up replication of eukaryotic chromsomes


break and rejoin dna to reduce torsionao strain

a phosphate in dna;

covalently link to two deoxribose

which of the following depicts a relative arrangement of the complementary strands of a dna double helix?

3'-5' 3'-3' 3'-5' 3'-3' 5'-5' 5'-3'

a lagging strand forms by;

joining okazaki fragments

the immediate source of energy for dna replication is

the hydrolosis of necleotides with 3 phosphate groups

which of the following enzymes is not involved in neucleotide excission repair


which of the following statements about eukaryotic chromosome is false?

telomeres contain protien-coating genes.

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