Females have two X chromosomes, while males have only one. Most of the genes on the X chromosome, however, are expressed at the same level in both females and males. Which of the following statements regarding X chromosomes is correct?

You are a dog breeder and want to figure out the genotype of the female brown dog you have. Brown is the dominant phenotype, while white is the recessive. You decide to breed her with a male who is also brown and has strictly dominant brown alleles. If the female is heterozygous, what percentage of her litter should be white?

Rett syndrome is a sex-linked dominant disease found on the X-chromosome. If the offspring of a certain cross have a 50% chance of receiving the disease, regardless of gender, which of the following statements is true?

Red-green colorblindness is an X-linked recessive disorder. Which of the following scenarios is not a possible method by which this disorder can be inherited?

Someone has angleman syndrome, which is a disease passed from mother to offspring due to the mother having a deletion at chromosome 15, which type of epigenetic phenomenon is this?

Which of the following differentiates mitochondrial inheritance from X-linked inheritance?

A human with the genotype XX is __________.

If an embryo inherits both A alleles, the embryo will not develop to term. If they only have 1 allele, the child will have dwarfism.

What percentage of child will be of normal height out of a cross of two parents with dwarfism?

The pattern of inheritance of Syndrome V has been documented in a family. According to the pedigree shown below, which mode of inheritance cannot explain the pattern?

What is a Barr body?