Questions from Genetics

Q: An allele in Drosophila produces a star-eye trait in the

An allele in Drosophila produces a star-eye trait in the heterozygous individual. However, the star-eye allele is lethal in homozygotes. What would be the ratio of phenotypes of surviving offspring if...

Q: A seed dealer wants to sell four-o’clock seeds that will

A seed dealer wants to sell four-o’clock seeds that will produce only a single color of flowers (red, white, or pink). Explain how this should be done.

Q: The blood serum from one individual (let’s call this person individual

The blood serum from one individual (let’s call this person individual 1) is known to agglutinate the red blood cells from a second individual (individual 2). List the pairwise combinations of possibl...

Q: Which blood type phenotypes (A, B, AB, and

Which blood type phenotypes (A, B, AB, and/or O) provide an unambiguous genotype? Is it possible for a couple to produce a family of children in which all four blood types are represented? If so, what...

Q: Define the term epigenetic inheritance, and describe two examples.

Define the term epigenetic inheritance, and describe two examples.

Q: With regard to the numbers of sex chromosomes, explain why dosage

With regard to the numbers of sex chromosomes, explain why dosage compensation is necessary.

Q: What is a Barr body? How is its structure different from

What is a Barr body? How is its structure different from that of other chromosomes in the cell? How does the structure of a Barr body affect the level of X-linked gene expression?

Q: What is the difference between homologs and sister chromatids?

What is the difference between homologs and sister chromatids?

Q: Among different species, describe three distinct mechanisms for accomplishing dosage compensation

Among different species, describe three distinct mechanisms for accomplishing dosage compensation.

Q: Describe when X-chromosome inactivation occurs and how this leads to

Describe when X-chromosome inactivation occurs and how this leads to phenotypic results at the organism level. In your answer, you should explain why XCI causes results such as variegated coat pattern...