Exam 13: Observing Patterns in Inherited Traits

Which most completely describes the circumstances under which yarrow will alter its phenotype?  

In radishes,two incompletely dominant genes control color and shape.Red (R)is dominant over white (r),and heterozygotes are purple.Long (L)is dominant over round (l),and heterozygotes are oval.If a true-breeding long,red radish is crossed with a purple oval radish,give the F1 phenotypes and their percentages.

In horses,black coat color is influenced by the dominant allele (B),and chestnut coat color is influenced by the recessive allele (b).Trotting gait is due to a dominant gene (T),pacing gait to the recessive allele (t).If a homozygous black trotter is crossed to a chestnut pacer,which phenotype will be the most common in the F2 generation?  

Tall (D)is dominant to dwarf (d).If a true-breeding tall plant is crossed with a true-breeding dwarf plant,the F2 generation will have a tall:dwarf phenotypic ratio of __________.

A gene locus is  

If you were following the inheritance patterns of two different sets of multiple alleles located on different chromosomes,with locus 1 having five possible alleles and locus 2 having six alleles,there would be a total of _____ different possible gametes produced.

In a certain breed of chicken,two genes control color.A dominant allele (I)inhibits the expression of any color gene (C).The recessive allele (c)results in albinism when homozygous (cc).The F2 phenotypic ratios of a cross between a colored chicken (ii CC)with a white chicken (II cc)would be ____white,_____ colored.

If wire hair (W)is dominant to smooth hair (w),and you find a wire-haired puppy,which type of puppy would you use in a testcross to determine its genotype?  

Crosses between a yellow rat with a yellow rat always produce yellow offspring.Crosses between a white rat with a white rat always produce white offspring.The alleles affect the same aspect of coat color.The cross of a white rat with a yellow rat produces a cream rat.This type of inheritance pattern is called _______________?

In rabbits,there are four alleles at the c locus.Arranged in dominance sequence they are C (agouti),c^ch (chinchilla),c^h (Himalayan),and c (albino) Which of the following crosses will NOT be possible?

Four of the following will stimulate the production of males in water fleas.Which one is the exception?

A homozygous recessive where "A" represents the trait has two recessive alleles symbolized by __________.

The ABO blood types are an example of ____.  

Assume that plants with red flowers crossed with plants with white flowers give rise to plants with pink flowers.You can eliminate the plants with red flowers by crossing ________-flowered plants for the first generation,and _________-flowered plants for the second.

The role of environmental factors on gene expression is illustrated by ____.  

Figure 13.7 -Which offspring in the illustration above are homozygous recessive for both traits?  

In humans,environmental factors causing stress can impact  

Different molecular forms of the same gene are __________.

A gene that produces multiple effects is called a(n)  

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.Which of the following inheritance patterns explain the breeding results?