Exam 13: Observing Patterns in Inherited Traits

In a certain breed of chicken, two genes control color.A dominant allele (I) inhibits the expression of any color gene (C).A second recessive gene (c) results in albinism when homozygous (cc).Give the F₂ phenotypic ratio of a colored chicken ii CC with a white II cc.

The pea plant was an excellent choice for Mendel's experiments because

A gene locus is

In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color.The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p).A tall plant with white flowers crossed with a dwarf plant with purple flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white.What is the genotype of the parents?

Which of the following is NOT TRUE of cystic fibrosis?

Where would the CFTR gene not be heavily expressed?

__________ assorts gene pairs of homologous chromosomes independently of gene pairs on all other chromosomes.

An individual with a genetic makeup of aa BB is called

Multiple effects of a single gene is

Yarrow will not alter its phenotype in response to:

Assume that red plants crossed with white plants give rise to pink plants.Explain how to eliminate red plants if you start with two pinks.

Which of the following has been correlated with the ability of rats to cope with stress as adults?

A breeder of cattle has a herd of white cows and a roan bull.Hair color in this breed is controlled by an incompletely dominant gene.The two homozygous forms are either red or white, and the heterozygous is roan. (a) What colors of calves are expected and in what proportions? (b) Outline a procedure to develop an all-red herd.

Which of the following is FALSE about Marfan syndrome?

In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color.The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p).A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple, 1/8 tall white, 3/8 dwarf purple, and 1/8 dwarf white.What is the genotype of the parents?

In the late 1920s, a mutation occurred in many silver fox farms around the world.The fox farms that sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms.The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more.The results of their breeding experiments were as follows: (1) silver *silver >>> all silver offspring; (2) silver * platinum >>> equal numbers of silver and platinum; (3) platinum * platinum >>> two platinum for each silver offspring.Explain.

In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color by the recessive allele (b).Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t).What color horse would you use to find out the genotype of a black trotter? Give the genotype and phenotype.