Genetics exam 3 written questions

Based on your reading of the article "human genetic variation, shared and private," which of the following categories of alleles is thought to have originated during the rapid growth of human populations over the past few thousand years?
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Based on your reading of the article "human genetic variation, shared and private," which of the following categories of alleles is thought to have originated during the rapid growth of human populations over the past few thousand years?
Very rare "private" alleles that are limited to specific population
Aneuploidy is often the result of:
Nondisjunction
Based in the article "human genetic variation, shared and private," which of the following is true?
Due to reduced selection during the rapid expansion of human populations, humans average about 20 genes that are homozygous for loss of function mutations.
Single base pairs that differ between individuals in a population are known as:
SNPs (Single nucleotide polymorphism)
Hershey and Chase provided info supporting which of the following ideas?
DNA is genetic material
Individuals with down syndrome are trisomic for chromosome 21. The trisomy is caused by?
Nondisjunction
Sperm cells of a diploid nematode worm have 5 chromosomes. After completion of the S phase just before the start of meiosis I in a primary oocyte of this worm, how many chromatids would be present?
20
Stephen Pinker's maternal linkage was traced through?
Mitochondrial DNA
This person made the first genetic map of a chromosome, using linkage:
Alfred Sturtevant
A genetic human female of normal chromosome constitution (XX) carries an amorphic mutation in her SRY gene. How would this affect her phenotype?
This can't happen - females don't have a SRY gene
The haploid number of chromosomes in humans is 23. Which of the following tissues or cell types has 23 chromosomes, 46 chromatids?Secondary OocytesWhat concept was Darwin's work missing that Mendel's work would have provided, if only Darwin had known of Mendel's work?Particulate inheritanceYou observe a dividing cell that is in anaphase, and not that each chromosome moving away from the metaphase plate contains two chromatids. This cell is undergoing what type of anaphase?Anaphase II of meiosis.Mary Lyon was the first to propose what hypothesis?X chromosomes inactivation in mammalsAs discussed in the pinker article...which of the following could be contributing to unexplained variation in height?Many genes of small effect and environmental factors.Aneuploidy is often the result of?NondisjunctionThe two alleles of vole transferrin described in the previous question could be described as?CodominanceIan Chase provided information supporting which of the following ideas?DNA is genetic materialIn the ABO blood system, the O allele is recessive because:It produces no antigen protein.In humans, brachydactyly is a trait characterized by abnormally short fingers and is caused by a dominant allele. However, some individuals with the allele have normal fingers. This shows that brachydactyly is:Incomplete penetranceTourette Syndrome is a behavioral trait in humans producing vocal and motor tics. Some affected individuals have severe tics of both types. Some have less severe tics of both or one type. Some have very mild, generally unnoticeable tics of one type. This shows that Tourette Syndrome demonstrates:Variable expressivityThe product of DNA replication is?Sister chromatidsCrossing a fruit fly with wild type wings to a fly with miniature wings produces F1 flies with intermediate sized wings. When you cross two F1 's you produce 1⁄4 wild flies, 1⁄2 intermediate winged flies, and 1⁄4 miniature winged flies. What is the simplest explanation of the mode of inheritance of wing sizeIncomplete dominanceGene duplications provide important raw material for evolution to act on. Which is the most likely fate for a recently duplicated gene?Nondisfuntional pseudogene.Which method was most essential to the identification of the orexin receptor gene (Hrctr1) as the cause of narcolepsy in dogs and humans?Genetic mapping using linkageThe controversial "three-parent family" technique is used for?Curing genetic diseases caused by defective mitochondrial genomes.When we say that Mendel's theory of inheritance was "particulate", in the sense that Darwin was looking for, we mean that:Alleles usually pass-through crosses unchanged.When a wound heals cell division occurs. The type of cell division cycle involved in this division is called:MitosisWhat most directly controls an organism's phenotype?Protein function.Who realized that blending inheritance was not compatible with evolution by natural selection?Charles DarwinWhen does s phase occur during meiosis?Before prophase 1