Exam 3: Mendelian Genetics

The fundamental Mendelian process that involves the separation of contrasting genetic elements at the same locus is called ________.

Tightly curled hair is caused by a dominant autosomal gene in humans.If a heterozygous curly-haired person marries a person with straight hair,what phenotypes (and in what proportions)are expected in the offspring?

What are two typical testcross ratios?

Which phenotypic ratio is likely to occur in crosses of two completely dominant,independently segregating gene pairs when both parents are fully heterozygous?

Assuming no crossing over between the gene in question and the centromere,when do alleles segregate during meiosis?

How many different types of gametes can be produced by an individual with the genotype AABbCCddEeFf?

Assuming independent assortment,what proportion of the offspring of the cross AaBbCcDd X AabbCCdd will have the aabbccdd genotype?

A gene can have a maximum of two alleles.

Assuming complete dominance,a 3:1 phenotypic ratio is expected from a monohybrid sib or self-cross.

For the purposes of this question,assume that being Rh⁺is a consequence of D and that Rh^- individuals are dd.The ability to taste phenylthiocarbamide (PTC)is determined by the gene symbolized T (tt are nontasters).A female whose mother was Rh^- has the MN blood group,is Rh⁺ and a nontaster of PTC,and is married to a man who is MM,Rh^-,and a nontaster.List the possible genotypes of their children.Assume that all the loci discussed in this problem are autosomal and independently assorting.

Which of the following groups of scientists were influential around the year 1900 in setting the stage for our present understanding of transmission genetics?

Assume that a Chi-square test provided a probability value of 0.02.Should the null hypothesis be accepted?

What is the probability of flipping a penny and a nickel and obtaining one head and one tail?

Mendel's Law of Segregation is supported by a 1:1 testcross ratio.

Name the single individual whose work in the mid-1800s contributed to our understanding of the particulate nature of inheritance as well as the basic genetic transmission patterns.With which organism did this person work?

In peas,gray seed color is dominant to white.For the purposes of this question,assume that Mendel crossed plants with gray seeds with each other and the following progeny were produced: 320 gray and 80 white. (a)What is the most probable genotype of each parent? (b)What genotypic and phenotypic ratios are expected in the progeny of such a cross?

In a Chi-square analysis,what condition causes one to reject (fail to accept)the null hypothesis?

To test Mendel's Law of Segregation,the experimenter needs a minimum of two contrasting forms of a gene.