Exam 23: Patterns of Gene Inheritance

Some plants fail to produce chlorophyll,due to a recessive trait.If we locate a pea plant that is heterozygous for this trait,self-pollinate it,and harvest the seeds,what are the likely phenotypes of the resulting offspring?

Which of the following is NOT correct concerning the law of independent assortment?

In humans,brown eyes (B)is a simple dominant trait over blue eyes (b).What is the genotype of a brown-eyed woman who has a blue-eyed child?

You have two true-breeding rose bushes,one with red flowers and one with white flowers.A cross between these two roses yields a bush with white flowers that have red splotches.What condition does this demonstrate?

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.A heterozygous black,short-haired animal reproduces with a brown,long-haired animal.What is the expected phenotypic ratio of the offspring?

Which of the following represents the physical characteristics of the individual?

In a testcross,an organism with a dominant phenotype,but unknown genotype is crossed with which of the following to establish its genotype?

If pairs of factors separate independently of other pairs of factors,you are dealing with

In peas,yellow is dominant over green in seeds.With which of these is it best to cross a yellow-seeded pea plant to determine whether it is homozygous or heterozygous?

Indicate the phenotypic and genotypic ratios expected for the offspring from a straight-haired man and a wavy-haired woman.

Which of the following is an example of the blending of phenotypes?

In the human population,short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

When two or more sets of alleles affect the same trait in an additive fashion,it is termed

For Mendel's law of segregation to occur,the alleles must be

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells.There is no effective treatment for the disorder and individuals usually die in their 40s or 50s,10 to 15 years after the onset of symptoms.Which of these statements about Huntington disease is true?

In 1940,two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein called the Rh factor.The presence of Rh factor was labeled Rh positive (Rh⁺)and was found to be dominant over the absence of the blood factor (Rh^-).Under normal Mendelian inheritance,which of the following statements is/are FALSE?

Mendel carried out most of his research with

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F₂ offspring?

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F₂ offspring?