Homologous pairs of chromosomes often _____. (Concept 14.1E-Book)
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Gametes are produced by _____. (Activity 13A)
Normal human gametes carry _____ chromosomes. (Activity 13A)
Meiosis I produces _____ cells, each of which is _____. (Activity 13B)
two ... haploid
Meiosis II typically produces _____ cells, each of which is _____. (Activity 13B)
four ... haploid
During _____ sister chromatids separate.
At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids. (Activity 13B)
Synapsis occurs during _____. (Activity 13B)
Homologous chromosomes migrate to opposite poles during _____. (Activity 13B)
During _____ chromosomes align single file along the equator of a haploid cell.
At the end of _____ and cytokinesis there are four haploid cells. (Activity 13B)
During _____ a spindle forms in a haploid cell. (Activity 13B)
Which choice below is a basic difference between Mendel's particulate hypothesis and the blending hypothesis? (Concept 14.1E-Book)
The blending hypothesis, but not the particulate hypothesis, maintained that after a mating, the genetic material provided by each of the two parents is mixed in the offspring, losing its individual identity.
If a plant variety is true-breeding for a dominant trait, then _____. (Concept 14.1E-Book)
if the plant were allowed to self-pollinate, all of the progeny would have the dominant trait
A = big apples; R = red apples; a = small apples; r = yellow apples. You have one tree that produces big yellow apples and another tree that produces small red apples. When the two are crossed, you find that half of the new trees produce big red apples and half produce big yellow apples. What are the genotypes of the parents? (Concept 14.1E-Book)
AArr and aaRr
Assume tall (T) is completely dominant to dwarf (t). If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _____. (Concept 14.1E-Book)
all be tall
The F1 generation differed from the F2 in Mendel's experiments in that _____. (Concept 14.1E-Book)
all of the F1 showed the dominant phenotype, but only three-fourths of the F2 did
In a certain plant, the alleles A, B, and C are completely dominant to the alleles a, b, and c. A plant with the genotype AABbcc will have the same phenotype as a plant with the genotype _____. (Concept 14.1E-Book)
Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A tall plant is mated with a short plant. Which outcome below would indicate that the tall plant was heterozygous? (Concept 14.1E-Book)
The ratio of tall offspring to short offspring is 1:1.
What is indicated when a single-character testcross yields offspring that all have the dominant phenotype? (Concept 14.1E-Book)
The parent with the dominant phenotype was homozygous.
If a homozygous dominant is crossed with a heterozygote for a given trait, the offspring will be _____. (Concept 14.1E-Book)
all of the dominant phenotype
In Mendel's monohybrid cross of purple-flowered and white-flowered peas, all members of the F1 generation had the _____ phenotype because their genotype was _____ at the flower-color locus. (Concept 14.1E-Book)
purple-flowered ... heterozygous
If the two traits that Mendel looked at in his dihybrid cross of smooth yellow peas with wrinkled green peas had been controlled by genes that were located near each other on the same chromosome, then the F2 generation _____. (Concept 14.1E-Book)
would have deviated from the 9:3:3:1 phenotypic ratio that is predicted by the law of independent assortment
In carrying out his breeding studies, Mendel examined characters that had which of the following properties? (Concept 14.1E-Book)
All of the above.
The law of independent assortment _____. (Concept 14.1E-Book)
The first, second, and third answers are correct.
Homologous pairs of chromosomes often _____. (Concept 14.1E-Book
contain different alleles