Download Biology Test: Chapter 6 Introduction to Genetics 1. _____ What type

Biology Test: Chapter 6 Introduction to Genetics
1.
_____ What type of allele is always expressed?
a. dominant allele
c. recessive allele
2.
b. homologous allele
d. incomplete allele
_____In pea plants, the tallness or shortness is known as
a. genotype
c. dominance
3.
_____ The haploid number of chromosomes for a human is
a. 23
4.
b. phenotype
d. gametes
b. 26
c. 46
d. 92
_____ Cells that contain only a single set of chromosomes are
a. homologous
c. diploid
b. haploid
d. heterozygous
5.
_____ Which process reduces the number of chromosomes in a diploid cell by
half to produce gametes?
a. mitosis
6.
b. codominance
a. 50
d. meiosis
_____An identical pair of alleles for a trait(TT or tt) has what type of genotype?
a. homologous b. homozygous
7.
c. crossing-over
c. heterozygous
d. segregation
_____ In the cross Tt x tt, what percentage of pea plants will be short?
b. 75
c. 25
d. 100
8.
_____ Crossing different true-breeding(purebred) stocks produces offspring
called
a. P generation b. F2 generation
9.
a. traits
c. cross-overs
d. hybrids
_____ The different forms of a gene are called
b. alleles
c. gametes
d. hybrids
10.
_____Crossing over is the exchange of genetic information between
a. reproductive cells
c. any 2 chromosomes
b. diploid cells
d. homologous chromosomes
11. In a pea plant, axial flower position is dominant over terminal
flower position. What genotype and phenotype ratios will result if a
heterozygous axial pea plant is crossed with a pea plant with terminal
flowers? (Show work)
12. During metaphase I of meiosis, homologous chromosomes line up at
the equator of a cell.
A) Diagram this in a cell with four chromosomes.
B) Label: chromosome, chromatid, spindle fiber, pole, centromere,
tetrad
C) Explain what happens next.
13. Look at the diagram below of Polygenic Inheritance Parakeets.
 Draw a diagram how a blue and a yellow parakeet may produce a
yellow parakeet. Be sure to show which gametes are used from
each parakeet to produce a green parakeet.
14. A female horse that is pure black and a pure trotter is crossed with a
male horse that is hybrid for both traits.
A) What are the genotypes of the parents?
B) What gametes are produced by each of the parents?
C) Draw a Punnet square representing this cross.
D) What are the genotypic and phenotypic ratios that result?
Genotype:
Phenotype:
During which phase(s), does following occur? Write the correct answer
on the line provided. For some, there may be more than one answer.
S phase of Interphase
Metaphse II
Prophase I
Anaphase I
Prophase II
Anaphase II
Metaphase I
Telophase I
Telophase II
1. __________ The chromosomes line up as a tetrad at the equator.
2. __________ The chromosomes move to the poles.
3. __________ The spindle fiber shortens.
4.__________ DNA synthesis occurs.
5. __________Homologous chromosomes pair up at the equator.
6. __________The cell membrane pinches forward.
7. __________ The sister chromatids divide and move apart.
8.__________Chromosomes lined up at the equator is not in a tetrad.
9.__________ Homologous chromosomes BEGIN to pair up.
10.__________ Sister chromatids, still joined, move toward the poles.