42 terms

chapter 5 test

Mrs. Hall
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an example of a species characteristics in humans would be
thumbs
hair and eye color, body build, and facial features are inherited and are called
individual characteristics
sections of a chromosome that code for a trait are called
gene
when two haploid cells unite, they form a diploid cell called a/an
zygote
the austrian monk who established the first laws and principles of heredity was
mendel
the separation of pairs of genes on homologous chromosomes during the formation of gametes demonstrates the concept of
segregation
the principle of genetics involved when one gene in a pair masks or prevents the expression of the other is called the principle of
dominance and recessiveness
in guinea pigs, black hair is dominant over white hair. if a homozygous black guinea pig was crossed with a homozygous white guinea pig, the F1 offspring probability would be
all black
the phonotypic ratio of the offspring: TT, Tt, tt, TT, is
3:1
the ability of a person to roll his tongue is due to a dominant allele, T. a woman who can roll her tongue is married to a man who cannot. 2 of their 4 children have the ability to roll their tongues, and 2 do not. what are the parents genotypes
mother, Tt; father, tt
in humans, free ear lobes are determined by a dominant fene, F, and ear lobes that are attached are determined by a recessive gene, f. a woman with free ear lobes married a man with attached ear lobes. their first child attached ear lobes. which of the following expresses the mothers genotype?
FF
possessing a pair of identical alleles for one trait is known as
homozygous
if an organism has two different genes for a single trait, the organism is said to be
heterozygous
a chart that enables one to visualize gene pairing is called a
punnett square
a chart showing the phenotype of the individuals in several generations of a family is a
pedigree
a test cross involves mating an organism that has an unknown genotype but dominant phenotype with
a homozygous recessive organism
the products of mitosis are
2 n cells
the union of two haploid gametes is
sexual reproduction
haploid cells that unite to form a ------ are called --------
zygote, gametes
the products of meiosis are
4 n cells
----------- is the union of gametes
fertilization
gametes that are alike are ----. an example would be-----
isogametes, fungi
is the formation of sperm and produces -------- functional gamete(s)
spermatogenesis, 4
---------- is the formation of ovum and produces--------
oogenesis, 1 functional gamete and 4 polar bodies
interphase occurs
once in mitosis and once in meiosis
in the process of meiosis, the parents` sperm and ovum (egg) each have a chromosomal number that is reduced to the ---------- number
haploid
the human diploid chromosome number is
46
humans are more than just the sum of their inherited genetic potential and their environment since humans also have a spiritual nature
true
the number of chromosomes differs in different organisms but is the same in virtually all of the normal cells of an individual organism
true
a histone is a protein that helps protect and maintain the shape of a chromosome
true
the haploid number for a species with 14 pairs of chromosomes is
14
the sequence of the phases of mitosis is prophase, anaphase, metaphase, telophase, followed bu interphase
false
fertilization is the formation of gametes for reproduction
false
a flower is self-pollinated when it recieves pollen from a flower of the same kind of plant
true
an allele is the identical form of a gene
false
a locus is a particular site on a chromosome
true
a cross between organisms of genotypes _AA_ and _aa_ wil produce offspring that all have the same phenotype
true
a cross between organisms of genotypes _AA_ and _aa_ will produce offspring that all have the same genotype
true
a cross between organisms of genotypes _Bb_ and _Bb_ will produce offspring that all have the same phenotype
false
a cross between organisms of genotypes _cd_ and _cd_ will produce offspring that do not all have the same genotype
true
a cross between organisms of genotypes _Ee_ and _Ee_ could produce offspring that have any of the possible genotypes for this characteristic.
true
a cross between organisms of genotypes _cc_ and _dd_ will produce offspring that do not all have the same genotype
false
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