03 Mendel Revisited
Expansions of, complications of, and exceptions to Mendel's ideas.
- 1.
One of the most significant exceptions to Mendel's concepts of heredity the phenomenon of
- A.
Segregation
- B.
Independent assortment
- C.
Dominance
- D.
Linkage
- E.
The solar eclipse
Correct Answer
D. Linkage -
- 2.
The number of phenotypes produced in the F2 generation of a trihybrid cross is _________.
Correct Answer
8
eight - 3.
The number of genotypes produced in the F2 generation of a trihybrid cross is _________
Correct Answer
27
twenty-seven
twenty seven - 4.
The number of different types of gametes produced in the F2 generation of a trihybrid cross is _________
Correct Answer
8
eight - 5.
If you can't figure out the progeny of a cross in genetics, it is best to remember the old saying (borrowed from football), "When in doubt, _________!" (No, this one will not be on the exam.)
Correct Answer
Punnett - 6.
This pedigree shows a trait (dark circles or squares) caused by an autosomal recessive gene. Individual #2 is:
- A.
A heterozygous female
- B.
A heterozygous male
- C.
A homozygous female
- D.
A homozygous male
- E.
Hemizygous
Correct Answer
B. A heterozygous male -
- 7.
The trait (dark circles or squares) illustrated by the pedigree above is:
- A.
An X-linked recessive trait.
- B.
An X-linked dominant trait.
- C.
An autosomal recessive trait.
- D.
An autosomal dominant trait.
- E.
Caused by a gene on the Y chromosome.
Correct Answer
C. An autosomal recessive trait. -
- 8.
The trait (dark circles or squares) illustrated by the pedigree above is:
- A.
An X-linked recessive trait.
- B.
An X-linked dominant trait.
- C.
An autosomal recessive trait.
- D.
An autosomal dominant trait.
- E.
Caused by a gene on the Y chromosome.
Correct Answer
D. An autosomal dominant trait. -
- 9.
The trait (dark circles or squares) illustrated by the pedigree above is:
- A.
An X-linked recessive trait.
- B.
An X-linked dominant trait.
- C.
An autosomal recessive trait.
- D.
An autosomal dominant trait.
- E.
Caused by a gene on the Y chromosome.
Correct Answer
A. An X-linked recessive trait. -
- 10.
The dominance relationship between the red-flower allele and the white-flower allele in snapdragons is an example of _________.
Correct Answer
incomplete dominance
partial dominance
lack of dominance - 11.
The dominance relationship between the A allele and the B allele in in human ABO blood type is an example of _________.
Correct Answer
codominance - 12.
A mother who is blood type A has a child who is also blood type A. Which man can be ruled out as the possible father?
- A.
A man with blood type A.
- B.
A man with blood type B.
- C.
A man with blood type AB.
- D.
A man with blood type O.
- E.
None of these can be ruled out.
Correct Answer
E. None of these can be ruled out. -
- 13.
A woman with blood type AB has a child with blood type AB. Which man can be ruled out as the possible father?
- A.
A man with blood type A.
- B.
A man with blood type B.
- C.
A man with blood type AB.
- D.
A man with blood type O.
- E.
None of these can be ruled out.
Correct Answer
D. A man with blood type O. -
- 14.
An example of a human trait that shows incomplete penetrance is _________.
Correct Answer
Huntington Disease
Huntington's Disease
polydactyly - 15.
Assume that plant height in a certain plant is determined by three equally additive genes. That is, AABBCC plants are the tallest and aabbcc plants are the shortest. In the progeny of the cross:AaBbCc x AaBbCc_________/32 would be the next to the tallest plants. (Type in the numerator of this fraction.)
Correct Answer
3 - 16.
If a trait has a heretability (h2) = 0.15, then the trait is determined primarily by _________.
Correct Answer
the environment
environment
the environment.
environment. - 17.
In mice, the allele for agouti color (A) is dominant to the allele for black (a). However, regardless of which of these two alleles a mouse has, if it is homozygous recessive for the tyrosinase mutation (cc), it will be white. This is an example of the type of gene interaction called _________.
Correct Answer
epistasis.
recessive epistasis.
epistasis
recessive epistasis - 18.
In mice, the allele for agouti color (A) is dominant to the allele for black (a). However, regardless of which of these two alleles a mouse has, if it is homozygous recessive for the tyrosinase mutation (cc), it will be white. Among the progeny of the cross AaCc x AaCc, _________/16 will have white fur. (Type in the numerator of this fraction.)
Correct Answer
4 - 19.
In the type of gene interaction called gene suppression, an individual that is homozygous for two recessive mutations has the _________ phenotype.
Correct Answer
wild-type
wild type
nonmutant
non-mutant
normal - 20.
In Drosophila, one recessive mutation is found that causes the fly to have abnormally short wings. Then, months later, a second recessive mutation is found that causes the fly to have even shorter wings. When these two mutant strains are crosses, their progeny all have normal-length wings. You can concluded that:
- A.
The two mutations are alleles.
- B.
The two genes involved here are linked.
- C.
The two genes involved here are on the X chromosome.
- D.
9/16 of the F2 generation of this cross should have normal-length wings.
- E.
Complementation did not occur.
Correct Answer
D. 9/16 of the F2 generation of this cross should have normal-length wings. -
- 21.
Among the viable progeny of the cross of two yellow-furred mice, _________/3 should have yellow fur. (Type in the numerator of this fraction.)
Correct Answer
2 - 22.
The expression of a gene can be altered by moving it to a new chromosomal location (to a new locus). This phenomenon is called _______ (we didn't cover this one this year, 2010).
Correct Answer
position effect - 23.
Himalayan coat in rabbits, where fur can be white or dark, is due to a type of conditional mutation, more specifically a _______ mutation (we didn't cover this one this year, 2010, but it is the same as fur in Siamese cats).
Correct Answer
temperature sensitive - 24.
If a single mutation has more that one phenotypic expression, it is called a (an) _______ mutation.
Correct Answer
pleiotropic - 25.
If the phenotype is determined by the genotype of the mother, the trait is an example of the ________ (we didn't cover this one this year, 2010).
Correct Answer
maternal effect
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Dec 31, 2012Quiz Edited by
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