Genetics Answers

Identify the different types of chromosomal abnormalities that can lead to disease (e.g. insertions) and in a sentence or two, describe a disorder associated with one of these aberrations.

What role do you suspect melanin plays based on this information?

In fruit flies, the gene for white eyes is a SEX-LINKED RECESSIVE TRAIT.
(R) is red and (r) is white.
Cross a white-eyed female with a normal red-eyed male. (remember it is sex-linked so attach to X)
What percent of the offspring will have RED EYES?

In snapdragons, red flower color W is not completely dominant over white w. The heterozygous condition produces pink flowers. What will be the rest of a cross between two pink-flowered snapdragons? Between a pink and a white one?

Identify the different types of chromosomal abnormalities that can lead to disease (e.g. insertions) and in a sentence or two, describe a disorder associated with one of these aberrations.

Explain what is meant by the term ‘linked genes’ with respect to homologous recombination.

Discussed the concept of inheritance in regards to genetic traits. How does the Chromosomal Theory of Inheritance helped to advance our understanding of genetics?

In humans, diabetes is a sex-linked recessive trait. If a homozygous normal woman and a man, whose mother is a diabetic, have children, what will be the phenotypes and genotypes of their children?

How does DNA create parts of an organism?

The Hamster Pet Farm ordered a pair of black-haired for breeding. The first generation was all black hamsters. When the Farm mated hamsters of the first generation, one of the offspring turned out to be white. The Pet Farm said this must have been caused by a "hidden gene. For full marks-You must use, showing your understanding of these concepts to answer a below: Punnett Square, hybrid, pure, dominant, recessive, predict or chance, genotype-phenotype. This is worth 12 points so it should NOT be one sentence. a) Why did this happen? Explain the "hidden gene' and how one of the offspring could have been white in this family of hamsters. b) How could the owner get PURE black hamsters for mating.