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Chapter 14: Q14.2-3CC. (page 278)

Three characters (flower color, seed color, and pod shape) are considered in a cross between two pea plants: PpYyIi* ppYyii. What fraction of offspring is predicted to be homozygous recessive for at least two of the three characters?

Short Answer

Expert verified

The fraction of offspring to be homozygous recessive for at least two of the three characters will be 6 in the total 16 offspring. Thus, it will be 3/8.

Step by step solution

01

Homozygous

Organisms have many alternative forms of genes in their genetic material that are called alleles. When these alleles are found identically in the organism, it is called homozygous for that specific gene contributing to a trait.

In homozygous conditions, both dominant and recessive alleles express completely.

02

Step 2: Recessive traits

Recessive traits are expressed by an allele when it is in a homozygous condition. It can be masked by the presence of other dominant alleles but persists in heterozygous conditions and express when inherited in homozygous conditions.

03

Step 3: Fraction of offspring that is homozygous recessive for at least two of the three characters 

Two plants having PpYyIi and ppYyii genotypes are crossed while considering three characters (flower color, seed color, and pod shape). One plant having PpYyIi will produce 8 types of gametes (PYI, PYi, PyI, Pyi, pYI, pYi, pyI, pyi), and another plant having ppYyii will produce 2 types of gametes (pYi and pyi).

Genotypes of offspring after crossing these plants will be PpYYIi, PpYyIi, PpYYii, PpYyii, PpyyIi, Ppyyii, ppYYIi, ppYyIi, ppYYii, ppYyii, ppyyIi, ppyyii.

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Most popular questions from this chapter

In tigers, a recessive allele of a particular gene causes both an absence of fur pigmentation (a white tiger) and a cross-eyed condition. If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross-eyed? What percentage of cross-eyed tigers will be white?

A rooster with gray feathers and a hen of the same phenotype produce 15 gray, 6 black, and 8 white chicks. What is the simplest explanation for the inheritance of these colors in chickens? What phenotypes would you expect in the offspring of a cross between a gray rooster and a black hen?

The pedigree below traces the inheritance of alkaptonuria, a biochemical disorder. Affected individuals, indicated hereby the colored circles and squares, are unable to metabolize a substance called alkapton, which colors the urine and stains body tissues. Does alkaptonuria appear to be caused by a dominant allele or a recessive allele? Fill in the genotypes of the individuals whose genotypes can be deduced. What genotypes are possible for each of the other individuals?

Over the past half-century, there has been a trend in the United States and other developed countries for people to marry and start families later in life than did their parents and grandparents. What effects might this trend have on the incidence (frequency) of late-acting dominant lethal alleles in the population?

Hemochromatosis is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, what is the probability of each of the following?

(a) All three children are of normal phenotype.

(b) One or more of the three children have the disease.

(c) All three children have the disease.

(d) At least one child is phenotypically normal.

(Note: It will help to remember that the probabilities of all possible outcomes always add up to 1.)
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