enetics Review Questions
In pea plants, the gene for green seeds (G) is dominant over the gene for yellow seeds (g). How is the genotype for the
heterozygous condition written?
a. Green
b. Gg
c. Yellow
d. GG
If a black furred male gerbil and a white furred female gerbil mate, why will all their offspring be black furred?
a.
Both genes controlling color come from the same parent.
b.
Genes from the male are stronger than those from the female.
c.
The gene for black fur is dominant over the one for white fur and the male is homozygous for black fur.
d.
none of these.
Which of the following is the most likely symbol for a genotype?
a.
FG
b. Pp
c. Pf
d. Gp
Each parent gives one of these to the offspring.
a. Alleles
b. phenotypes
c. traits
d. features
plant with two dominant OR two recessive alleles is said to be
a. hybrid
b. heterozygous
c. homozygous
d. self breeding
Which one of the following statements is NOT true?
a.
One gene can influence many traits.
b.
Several genes can influence a single trait.
c.
The environment can have an influence on traits.
d.
Genes are the only influence on traits.
Punnett square tells you a. which genes are dominant.
b.
how to be sure your offspring gets the traits you want.
c.
The chance (probability) of certain genotypes occurring in the offspring.
d.
that the male’s traits are more likely to be passed onto the offspring.
he loss of a chromosome is often fatal because
a.
The organism will not be able to make the proteins it needs.
b.
The organism will make proteins with the wrong sequence of nucleotides.
c. Mitosis cannot happen
d. None of these
tudying heredity has shown thata.
female traits are more likely to be passed down than the male’s.
b.
lighter colors dominate over darker colors.
c.
only half of each parent’s chromosomes are passed on to the offspring.
d.
the traits expressed in the offspring are exactly half from mom and half from dad.
What does each gene have instructions for making?
a. a cell
c.
a protein
b. a ribosome
d.
Enzyme
If one pea plant has the gene combination Tt for height and another has the combination TT for height (T=tall and t=
short) the plants would still have the samea. genotype
b. phenotype
c. flower color
d. none of these
What did Mendel discover about recessive traits?
a.
Recessive traits reappear in the second generation.
b.
Recessive traits disappear altogether.
c.
Recessive traits never appear in the second generation.
d.
Recessive traits become dominant.
Segments of DNA with instructions for building proteins are called
a. Organelles
b. proteins
c. genes
d. none of these
The different forms of a gene that decide a characteristic are known as
a. alleles b. proteins
c. genes
d. albinism
If the genetic trait is represented by the letter “A”, which of the following would most likely be used to show the recessive
condition?
a. AA b. AB
c. Aa d. none of these
In a Punnett Square, a capital letter stands for a _______ allele.
a. Recessive
b. mutant
c. homozygous
d. dominant
The structures that pass on the traits of a cell to new cells are called:
a. chromosomes b. centromeres c. centrioles d. ribosomes
The combination Tt represents a _____ genotype.
a. recessive
b. Purebred c. Sex-linked
d. none of these
Which genetic disorder requires that both parents donate a faulty gene to the offspring?
a. Down’s Syndrome
b. Sickle Cell Anemia
c. Hemophilia
d. HIV
In humans, the allele for dimples (D) is dominant while no dimples (d) is recessive. A woman (DD) and a man (Dd) have
four children. Which of the following is the predicted result?
a. None had dimples
b. 75% had dimples
c. 50% had dimples
d. all had dimples
During transcription of DNA onto an RNA molecule, a uracil is added to the RNA chain. What was the DNA base that
led to this placement?
a. Adenine
b. Thymine
c. Cytosine
d. None of these
What best expresses the relationship between genes and DNA?
a. genes carry DNA
c. both carry chromosomes
b. DNA carries genes
d. they are not related to each other
23. A plant is heterozygous might have the following indicator: ____How we show a homozygous plant?
24. A cross between two purple plants (PpxPP) is likely to produce how many white flowered plants?
A. 100%
B. 25%
C. 0%
D. 50%
25. Create a punnett square: Bb x Bb. What % of offspring show the recessive trait?
BB x bb?
Bb x bb?
26. What do we mean by diploid and haploid numbers?