Exam 11: Patterns of Inheritance

31) Imagine that a newly discovered species of fish normally has three eyes ( E), but the rare mutation (e) causes ?diopthalmic? fish with two eyes to be born. In addition, eye color in these fish is inherited similarly to humans, with black eyes (B) being dominant to blue (b). Assuming these two genes are carried on separate chromosomes, what must the genotypes of two black -eyed, three-eyed parents be if they have a blue-eyed, diopthalmic son?

All of the following combinations are possible in the gametes of an organism that is AaBb EXCEPT

Hemophilia is a sex-linked recessive gene that causes a blood disorder. What are the chances that the daughter of a normal man and a heterozygous woman will have hemophilia?

What type of allele produces its effects in only homozygous individuals?

The blood types of humans are an example of__________ .

Human females who receive sex-linked genes always express them.

Which disorder is characterized by an abnormal number of autosomes?

-Hemophilia is a genetic disease that has plagued the royal houses of Europe since the time of Queen Victoria, who was a carrier. Her granddaughter, Alexandra, married Nicholas II, the last czar of imperial Russia. Alexandra was a carrier for hemophilia, but Nicholas was normal. Their son, Alexis, was afflicted with the disease. Based on this scenario, it is most likely that

Imagine that you self-pollinate heterozygous purple-flowered, long-pollened pea plants and get mostly purple-flowered, long-pollened plants and white-flowered, short-pollened plants, with a few purple-flowered, short-pollened or white-flowered, long-pollened plants. What is the most likely explanation?

Round pea shape (R) is dominant over wrinkled pea shape (r). If a round pea has a wrinkled parent, the round pea is

In humans, the sex of the offspring is determined by the

Sickle-cell anemia is caused by a

When the expression of a trait is influenced by the action of many genes, the pattern of inheritance is called

What is the ratio of phenotypes in the offspring produced by the cross Aa × Aa? Assume complete dominance for the trait.

When the two gametes that fuse to form a zygote contain different alleles of a given gene, the offspring is

If you cross pea plants that are both heterozygous for purple flowers and yellow seeds ( PpYy), and you examine 800 offspring for flower and seed color, about how many do you expect to have white flowers and green seeds?

What would be TRUE if linkage of two genes was complete?

Which of the following is TRUE of genes that are physically located close to each other on the same chromosome?