Exam 11: The Basic Principles of Heredity

A brown-eyed couple heterozygous for eye color are planning on having two children.What is the probability that both children will have blue eyes, assuming brown eyes is dominant and blue eyes is recessive?

What is the probability that two lizards that are heterozygous for stripes on their tails (Ss) will produce an offspring that is homozygous for no stripes (ss)?

The existence of of a particular locus can only be inferred if there are no allelic variants at that locus. __________________

What are the possible phenotypes of the children if the mother has Type A blood and the father has type AB blood? (Use the Punnett square to verify your answer.)

MATCHING a.incomplete d.pleiotropy b.codominance e.polygenic c.epistasis -The heterozygote has a phenotype intermediate between those of two parents

In a Punnet square, the type of gametes and their expected frequencies from one parent are listed across the top and those from the other parent are listed across the left side. __________________

Each unduplicated chromosome consists of two DNA molecule(s). __________________

MATCHING a.incomplete d.pleiotropy b.codominance e.polygenic c.epistasis -One defective enzyme may affect function of many cells

Two Martians fall in love and marry.One Martian is homozygous for red eyes and the other is heterozygous.The recessive eye color is purple.What are the chances that the alien couple will have a child with red eyes?

__________ are alternative forms of a gene that govern the same feature, such as eye color, and occupy corresponding positions on homologous chromosomes.

What is an X-linked inheritance pattern? Use a specific example to explain the role of the father and mother in this unique inheritance pattern and note the differential impact on male and female offspring.

In genetics, map units express the distance between:

A lizard with striped tails is crossed with one having a spotted head, producing normal looking (no stripes or spots) progeny.What progeny would be expected to be produced by mating one of these lizards with another that had a striped tail and spotted head, if the genes conferring stripes and spots were close together on the same chromosome?

Dominance is not consistent with blending inheritance. __________________

The mating of totally unrelated homozygous strains of corn produced a new strain of corn that was very different from both parental strains in many characteristics.Give some reasons to explain this phenomenon.

The principle of independent assortment is not true for:

Two Martians fall in love and marry.One Martian is homozygous for red eyes and the other is heterozygous.The recessive eye color is purple.What is the probability that they will have a child with purple eyes?

Genes that tend to be inherited together are said to be:

__________ refers to multiple independent pairs of genes having similar and additive effects on the same characteristic.

Examination of a phenotype can always determine the genotype of an organism. __________________