Genetics Practice Quiz

*1. If a corn plant has a genotype of Ttyy, what are the possible genetic combinations that could be present in a single grain of pollen from this plant?
Ty, ty
TY, ty
TY, Ty, ty
Ty, ty, tY, TY

*2. In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. What are the possible combinations of genes in the offspring of two red-eyed heterozygous flies (Rr)?
RR only
rr only
Rr and rr only
RR, Rr, and rr only

*3. In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal hearing is due to its dominant allele (D). What percentage of the offspring of a normal heterozygous (Dd) dog and a deaf dog (dd) would be expected to have normal hearing?
0%
25%
50%
100%

*4. Fur color in cats is controlled by an autosomal gene that can occur in the dominant form, (B), or the recessive form, (b). The length of the cat's fur is controlled by another autosomal gene which occurs in the dominant form, (S), or the recessive form, (s). The table below shows the traits for these allele codes.

The following genotypes were found in a male cat and a female cat.

Which one of the following choices is true of the phenotype of offspring from these parents?
All offspring will have black fur.
All offspring will have white fur.
All offspring will have long-haired fur.
All offspring will have short-haired fur.

*5. Mendel hypothesized that reproductive cells have only one factor for each inherited trait. This hypothesis is supported by the observation that
haploid cells are produced by mitosis.
diploid cells are produced by mitosis.
haploid cells are produced by meiosis.
diploid cells are produced by meiosis.

*6. The bacterium Agrobacterium tumefaciens infects plants, and a portion of its DNA is inserted into the plant's chromosomes. This causes the plant to produce gall cells, which manufacture amino acids that the bacterium uses as food. This process is a natural example of
polyploidy.
genetic manipulation.
grafting.
hybridization.

*7. Genetic engineering has produced goats whose milk contains proteins that can be used as medicines. This effect was produced by
mixing foreign genes into the milk.
injecting foreign genes into the goats' udders.
inserting foreign genes into fertilized goat eggs.
genetically modifying the nutritional needs of the goats' offspring.

*8.

The chart shows four alleles at the same locus that affect rabbits' coat color. Each allele is dominant to the ones below it. Rabbits with an albino or Himalayan coat are more susceptible to predators. Which of the following genotypes will produce a rabbit that is least likely to survive?
cchc
Cc
chc
Cch

*9. In carrier pigeons there is a rare inherited condition that causes the death of the chicks before hatching. In order for this disease to be passed from generation to generation there must be parent birds that
are heterozygous for the disease.
have the disease themselves.
produce new mutations for this disease.
are closely interbred.

10. A child can have blue eyes when both its parents have brown eyes because
the gene for blue eyes is recessive
each parent must have a gene for blue eyes
the child had a 25% chance for blue eyes with blue-eyed recessive parents
all of the above

11. Females gametes only have the ability to produce
blue eyes
female offspring
estrogen
male offspring

12. Genes that will be expressed regardless of how many there are, are
somatic
sex-linked
dominant
autosomal


Score =
Correct answers:

*taken from 2003, 2004, 2005 CDE Released Test Questions-http://www.cde.ca.gov/ta/tg/sr/css05rtq.asp
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