Zoology Exam Flashcards
A cross between individuals both homozygous for two genes?
Dihybrid Cross
The alleles present in an individual
Genotype
The allele that is not expressed in the heterozygote?
Recessive
The sequence of bases in one stand of DNA specifies the sequence of the opposite strand?
Complimentary
Visible or expressed characteristics?
Phenotype
When two different alleles are present
Phenotype
A cross between the homozygous recessive with those that show the dominant phenotype
Testcross
Alleles with one gene separate into gametes randomly with respect to alleles of other genes
Independent Assortment
Strands of DNA run in opposite directions
Anti paraelle
Alleles of a gene are separated into different gametes
Segregation
Alternative form of a gene
Alleles
When one allele is not dominant to the other, but they are equal
Incomplete Dominance
When both alleles are the same
Homozygous
A cross between individuals both homozygous for one gene
Mono hybrid cross
All chromosomes besides sex chromosomes
Autosomes
The allele that is expressed when present
Dominant
Inner germ layer
Endoderm
Outer derm later
Exoderm
Individuals are both male and female
Monoecious
Eggs retained for development, nourishment derived from yolk within the egg
Ovoviviparous
Body cavity surrounded by mesoderm
Coelom
Differentiated mass of cells, forms invagination
Gastrula
3rd germ layer, between inner and outer
Mesoderm
Animals with only 2 germ layers
Diplosblastic
Eggs retained for development, nourishment derived directly from the mother
Viviparous
Mass of cells formed from the zygote dividing by mitosis?
Blastula
Individuals are either male or female
Dioecious
An animal that lays eggs in the environment for development?
Oviparous
Body cavity surrounded by endoderm
Gut
List the 4 phases of mitosis in the order they occur?
P.M.A.T
Is mitosis asexual or sexual?
Asexual
Is meiosis sexual or asexual?
Sexual
Meiosis results in how many daughter cells?
FOUR
What are the daughter cells, which are sex cells, called?
Gametes
What do daughter cells transmit from parent to offspring?
Genetic info
Chromosomes share a common feature, what is this common feature?
Pairs
In meiosis, how many times does the cell replicate?
Once
What phase does crossing-over occur in?
Prophase 1
In Metaphase 2 Meiosis or metaphase mitosis do are they lined up in a line or 2 and 2
In a line
What are the sex chromosomes of a female?
X
What are the sex chromosomes of a male?
Xy
Female gametes have which possible sex chromosome?
X
Male gametes (sperm) have which possible sex chromosomes?
X or Y
The visible expressed characteristics?
Phenotype
The allelic combination or what the alleles are present?
Genotype
Describes the allele that is expressed when it is present?
Dominant
Describe the allele that is not expressed unless both alleles are the same?
Recessive
Describe when both alleles are the same?
Homozygous
Describe when the alleles are different?
Heterozygous
A cross between individuals both homozygous for ONE gene is
Monohybrid Cross
A cross between individuals both homozygous for TWO genes is
A dihybrid cross
How many genes are involved in a dihybrid cross?
4
Genes that are sex-linked are located on which sex chromosome?
X Chromosomes
What is the process in which DNA is used to make mRNA?
Transcription
What is the process in which mRNA is used to make proteins?
Translation
What type of RNA has the antibodon, and attaches the amino acids together during translation?
tRNA
Which type of reproduction involves one parent, requires no reproductive organs or cells and produces a genetically identical offspring?
Asexual
What is a genetically identical offspring called?
Clone
A multi-cellular organism breaks apart, and each piece grows new parts and forms a new indiviual?
Fragmentation
A new individual arises as an outgrowth from the parent
Budding
The body of the a parent divides by mitosis?
Fision
If the individuals of a species have bothe male and female sex organs, the species is what
Monoecious
Genes that are located on the C chromosome and not he Y are said to be what?
Sex-linked genes
What is the phenotypic ratio of the f2 generation of a monohybrid cross?
3:1
What is the genotypic ration of the f2 generation of a monohybrid cross?
1:2:1
If one allele is not dominant to the other and a cross between the two gives rise to a different pehnotype, the alleles are showing what?
incomplete dominance
Chromarids seperate and move to opposite poles
Anaphase
The cells begins to divide
Telophase
The centrioles replicate and move to opposite poles, the nuclear envelope disappears, and the chromosomes become visible
Prophase
What are the alternative forms of genes that code for the same trait occus on homologous chromosomes called?
Alleles
When a pair of gamates unite in fertilixation, the newly formed cells, which is diploid, is called what?
Zygote