Exam 8: Sexual Reproduction and Heredity

Consider the two traits, seed shape and seed color. R represents the allele for round seeds, r the allele for wrinkled seeds, Y the allele for yellow seeds, and y the allele for green seeds. Which of the following indicates a cross between a plant heterozygous for both traits and a plant homozygous recessive for both traits?

Which of the following statements about sexual reproduction is FALSE?

A nucleosome is composed of histone proteins wrapped around a DNA filament.

An aquatic plant produces one type of leaf above water and another type of leaf under water. This is most likely an example of:

A nucleosome consists of:

Homologous pairs of chromosomes separate during:

Crossing-over occurs during:

The seeds of all the progeny of a cross between yellow-seeded plants and green-seeded plants are as yellow as those of the yellow-seeded parent. From this information, it is clear that:

It is likely that one of the four daughter cells resulting from meiosis will be genetically identical to one of the gametes that fused to produce the diploid line of cells undergoing meiosis.

Sister chromatids separate during anaphase I.

In peas, tall stem length is dominant over short length. What genotypic ratio would you expect in the offspring of a cross between a heterozygous tall plant and a homozygous short plant?

Which of the following statements about sexual reproduction is FALSE?

Consider a chromosome represented as ABC·DEFG, where · indicates the centromere. Suppose ultraviolet light causes the chromosome to change to AC·DEFG. What type of mutation has occurred?

If two genes are linked, then by definition they:

By crossing different varieties of peas ______ discovered the principles of heredity.

If W represents the allele for purple flower color, and w represents the allele for white flower color, what phenotypic ratio would you expect for the offspring of a testcross?

Suppose that a plant has two genes that are linked, with Ab on one homolog of a homologous pair of chromosomes and aB on the other homolog. What gametes could the plant produce if crossing-over occurred between these genes during meiosis?

Cytoplasmic inheritance in plants involves genes present in the:

If a cell has three pairs of homologous chromosomes, in how many ways could they be distributed among the haploid cells produced by meiosis?

In ______, a single gene has many different effects on the phenotype.