Exam 12: Chromosomes and Inheritance

Now that we know the complete gene sequence (genome) of humans, will this knowledge make it more or less difficult for prospective parents who are concerned about inherited diseases and defects? Explain.

Which disease is autosomal and results in misshapen cells that clog capillaries?

Much genetic information can be derived from pedigrees (family genetic histories). This is the primary method for obtaining genetic information for humans because:

Refer to the figure above and then answer the question that follows. -What are the characteristics of the human sex chromosomes?

Phenylketonuria is an autosomal dominant disorder.

Thomas Hunt Morgan, working with fruit flies, discovered that male fruit flies could have the mutant trait of white eyes, even if they had only one "white allele. What was the significance of this finding?

What is prenatal testing?

A karyotype reveals that a woman is carrying a fetus that has 47 chromosomes. The test reveals that the genotype of the fetus is XXY. Which of the following statements is correct?

Refer to the figure above and then answer the question that follows. -A person with the genotype XO is mainly female, phenotypically. A person with the genotype XXY is mainly male. What can you conclude about the Y chromosome?

If a disease is autosomal recessive like sickle-cell anemia, it is caused by:

A man and a woman are both carriers of sickle-cell anemia. The man is color blind. The woman is not color blind, nor is she a carrier of color blindness. Draw two Punnett squares, one showing inheritance of sickle-cell anemia, and the other showing inheritance of color blindness in this family.

Plants that are polyploid either do not survive or, if they do, are sickly and weak.

What was the significance of Thomas Hunt Morgan's observation that a male fruit fly could have white eyes with only one "white allele?

Which of the following chromosome combinations would NOT result in a viable zygote that could develop into an adult?

What causes sickle-cell anemia?

Why is Drosophila-the fruit fly-good experimental material in genetics?

Which condition is caused by a chromosomal deletion?

Refer to the figure above and then answer the question that follows. -Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which of the events is likely to produce a higher percentage of abnormal gametes?

The term for having one extra or one fewer chromosome than the standard diploid set is ________.

On which human chromosome is the gene for opsin, the visual pigment located?