Exam 13: Chromosomes, Mapping, and the Meiosis-Inheritance Connection

Which of the following animals is a genetic male?

In humans, the male has an X and a Y sex chromosome.The human female has two X chromosomes.In birds, the female has a Z and a W sex chromosome while the male has two Z chromosomes.Which of the following statements is accurate about which parent determines the gender of the offspring based on inheritace of the necessary sex chromosome?

If an XY human had a genetic disorder that causes insensitivity to androgens, that person's genotype and phenotype would be

Any genetic differences between individuals in a population are called

In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY.When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F₁ progeny had white eyes but 18% of the F₂ progeny had white eyes.Unexpectedly, all of these white-eyed F₂ flies were males.Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele.Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F₁ flies were females.In this case, a valid hypothesis would be

If a human female has 2 Barr bodies per cell, it is almost certain that

The most common fatal genetic disorder of Caucasians is

Why isn't mitochondrial DNA a unique identifier?

Genetic maps are based on recombination frequencies.Because both odd and even numbers of crossovers can occur between any two gene loci, as the physical distance between two loci increases, the maximum recombination frequency levels off at 50%.However, suppose you discovered a species where only an even number of crossovers can occur between any two gene loci.In this case, as the physical distance between two loci increases, you would expect the maximum recombination frequency to

In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone.Why?