BioSemExam Part 2 Question Preview (ID: 34235)
Semester Test.
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Sister chromatids separate and move to opposite poles in the cell
a) prophase
b) telophase
c) anaphase
d) metaphase
Which list shows the phases of mitosis in the correct order?
a) prophase, metaphase, anaphase, telophase
b) prophase, anaphase, metaphase, telophase
c) anaphase, metaphase, prophase, telophase
d) metaphase, prophase, telophase, anaphase
Which statement correctly describes the number of chromosomes in body cells and gametes?
a) body cells and gametes are both diploid
b) body cells and gametes are both haploid
c) body cells are diploid and gametes are haploid
d) body cells are haploid and gametes are diploid
Produces four daughter cells with the haploid number of chromosomes
a) meiosis
b) mitosis
c) interphase
d) cytokinesis
Why is it important that the number of chromosomes be reduced during meiosis?
a) The cell can grow without the DNA content increasing
b) The amount of DNA in the cell can remain at its lowest number
c) The chromosome number will stay constant from one generation to the next
d) The nucleus of the cell will not be allowed to become larger due to cell growth
Which statement correctly describes the genetic makeup of the sperm cells produced by a human male?
a) Each cell has a complete pair of chromosomes and the cells are usually genetically identical
b) Each cell has double the amount of chromosomes and the cells are usually genetically different
c) Each cell has half the normal number of chromosomes and the cells are usually genetically identical
d) Each cell has half the normal number of chromosomes and the cells are usually genetically different
The specialized cells that result from meiosis are
a) Gametes
b) Body Cells
c) Cancer Cells
d) Autosomes
The diploid number of chromosomes in a human skin cell is 46. How many chromosomes are in a human egg cell?
a) 46 chromosomes
b) 92 chromosomes
c) 23 chromosomes
d) 12.5 chromosomes
Which term describes the failure of homologous chromosomes to segregate properly during meiosis?
a) polyploidy
b) recombination
c) nondisjunction
d) independent assortment
Who is the father of genetics?
a) Robert Hooke
b) Watson and Crick
c) Gregor Mendel
d) Erwin Chargaff
When Mendel crossed tall heterozygous plants, what results did he observe in the next generation?
a) 100% tall plants
b) 100% medium plants
c) 75% tall plants and 25% short plants
d) 50% tall plants and 50% short plants
The law of segregation explains that
a) different alleles of a gene can never be found in the same organism
b) each gene of an organism ends up in the same gamete
c) each gene is found on a different molecule of DNA
d) alleles of a gene separate from each other during meiosis
Which of Gregor Mendel's discoveries is represented when a black dog and a white dog mate, and all the resulting puppies are black?
a) dominance
b) sex linkage
c) segregation
d) independent assortment
Roan horses have alleles for both red and white hair and display both traits (meaning their coat is a speckled mixture of red hairs and white hairs). This is an example of:
a) Recessive dominance
b) Incomplete dominance
c) Complete dominance
d) Codominance
In four o'clock flowers, the alleles for red and white flowers show incomplete dominance. Heterozygous four o'clock plants have
a) white flowers
b) pink flowers
c) half pink flowers and half red flowers
d) red flowers
Snapdragons with white and red flowers show incomplete dominance when they produce offspring. If a white snapdragon is crossed with a pink snapdragon, what are the possible phenotypes?
a) 1 pink, 2 red, 1 white
b) 2 pink. 2 red
c) 2 white, 2 pink
d) 2 red, 2 white
Which is an advantage of crossing over during meiosis?
a) it increases genetic variations
b) it decreases genetic variations
c) it keeps maternal and paternal chromosomes intact
d) it allows dominant genes to be expressed more often
Which mode of inheritance explains why a mother with a particular recessive tract will always pass it on to her son?
a) sex-linkage
b) codominance
c) multiple alleles
d) incomplete dominance
Which is the karyotype for the twenty-third pair of chromosomes of a normal human female?
a) XX
b) XXO
c) XXY
d) XY
The phenotypes of the pea plants resulting from this cross could be described as-
a) All tall
b) Half tall, half short
c) One-quarter tall, three-quarters short
d) Three-quarters tall, one-quarter short
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