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GENETICS: Exam 1 Questions
Terms in this set (24)
Not one of Mendel's conclusions
Genes on chromosomes
Tall vs short plant question: Which is NOT true?
It is not true that the tall and short traits assort independently.
In a cross between AaBbCc and AaBbcc, what proportion of the offspring would be expected to be A_BbCc?
Attached earlobes are an autosomal trait with 60% penetrance. One parent is Aa and the other is aa (homozygous recessive for the attached earlobe trait), probability of their first child having attached earlobes?
Achondroplasia affected humans are heterozygous at the locus. When two individuals with anchondroplasia mate, the offspring occur in a ratio of 2 achondroplasia: 1 normal. Explanation?
The allele that causes achondroplasia is a recessive lethal allele.
Difference between dominance and epistasis:
Epistatis masks genes at DIFFERENT loci.
In the ABO blood phenotype, which gene is the most epistatic?
If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild-type female, what proportion of the progeny will be mutant males?
The geneti conflict hypothesis attempts to explain observed patterns of:
If a color-blind female has children, what do we know about all of her sons?
All of the sons will be color blind.
How many Barr bodies are present in an individual with Klinefelter syndrome?
Example of X-chromosome expression equality in animals:
Female Caenorhabditis elegans express their X-chromosome genes at 50%.
Male fruit flies double the expression of their X-chromosome gene.
Female humans inactivate one of their X chromosomes.
Syntetic genes are:
On the same chromosome.
If genes A and B are linked, what is the maximum percentage of recombinant gametes that can be produced if a single crossover occurs during gametogenesis?
Recombination frequency percentage if progeny are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab
Most likely order of linked genes R, S, and T is distance between R and S is 22 m.u., the distance between S and T is 8 m.u., and the distance between R and T is 14 m.u.?
Which locus is in the middle?
A ____________ can be used to determine whether an individual is homozygous or heterozygous/
In humans ___ is the male determining gene.
______ _________ that are heterozygous for an X-linked gene have patches of cells that express one allele and patches of cells that express the other.
Illustrated cell picture labels, A through E:
A. Meiosis I metaphase
B. Mitosis metaphase
C. Mitosis anaphase
D. Meiosis I anaphase
E. Meiosis II metaphase
(meiosis has v's, mitosis has more than that)
The difference between homologous chromosomes and sister chromatids:
Homologous chromosomes can have different alleles. Sister chromatids are duplicates and are identical in sequence.
How to do a chi square test:
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