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Mastering Biology CH 14 homework
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Around the mid-1850s, Mendel crossed true-breeding purple-flowered pea plants with true-breeding white-flowered pea plants. The results of his research provided us with the basic principles of heredity.
Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Not all terms will be used.
Every gene is a sequence of DNA nucleotides at a specific position along a chromosome called a locus.
Diploid cells have two sets of chromosomes, one set inherited from each parent, that form homologous pairs.
The homologs of a chromosome pair contain the same genetic loci. Therefore, each genetic locus is represented twice in a diploid cell.
Variations in inherited characteristics is due to the presence of alleles, which are alternative versions of genes.
You know that alleles are alternative versions of a gene. What makes alleles different from each other?
They have different sequences of DNA nucleotides.
In the video, the paternal parent carries the allele for purple flowers, and the maternal parent carries the allele for white flowers. What would happen if the maternal parent carried the purple allele, and the paternal parent carried the white allele?
The F1 hybrid pea plants would still produce purple flowers.
In pea plants, the purple allele is sufficient for making purple flowers, even if one of the homologous chromosomes carries the white allele. Which of the following statements are true in this case?
Select all that apply.
The purple allele is the dominant allele.
The white allele is the recessive allele.
One purple allele results in enough purple pigment for the flowers to be purple.
Mendel studied pea plants dihybrid for seed shape (round versus wrinkled) and seed color (yellow versus green). Recall that
the round allele (R) is dominant to the wrinkled allele (r) and
the yellow allele (Y) is dominant to the green allele (y).
The table below shows the F1 progeny that result from selfing four different parent pea plants.
Use the phenotypes of the F1 progeny to deduce the genotype and phenotype of each parent plant.
Complete the table by dragging the correct label to the appropriate location. Labels can be used once, more than once, or not at all.
Parent phenotype plant 1: green round
Parent genotype plant 1: Rryy
Parent phenotype plant 2: yellow round
Parent genotype plant 2: RrYy
Parent phenotype plant 3: yellow round
Parent genotype plant 3: RRYy
Parent phenotype plant 4: green wrinkled
Parent genotype plant 4: rryy
A plant grown from a [round, yellow] seed is crossed with a plant grown from a [wrinkled, yellow] seed. This cross produces four progeny types in the F1:
[round, yellow], [wrinkled, yellow], [round, green], and [wrinkled, green].
Use this information to deduce the genotypes of the parent plants.
Indicate the genotypes by dragging the correct label to the appropriate location.
Parent genotype with yellow round: RrYy
Parent genotype with yellow wrinkled: rrYy
For the cross in Part B, predict the frequencies of each of the phenotypes in the F1 progeny, and determine the genotype(s) present in each phenotypic class.
Complete the diagram by dragging the correct label to the appropriate location. Labels can be used once, more than once, or not at all.
Expected frequencies yellow round: 3/8
Progeny genotypes yellow round: RrYY, RrYy (x2)
Expected frequencies yellow wrinkled: 3/8
Progeny genotypes yellow wrinkled: rrYY, rrYy (x2)
Expected frequencies green round: 1/8
Progeny genotypes green round: Rryy
Expected frequencies green wrinkled: 1/8
Progeny genotypes green wrinkled: rryy
The result of the following cross indicates the orange eyes are _____ black eyes.
If B represents the allele for black eyes (dominant) and b represents the allele for orange eyes (recessive), what would be the genotypic ratio of a cross between a heterozygous black-eyed MendAlien and an orange-eyed MendAlien?
0 homozygous black (BB): 1 heterozygote (black) (Bb): 1 homozygous orange (bb)
If B represents the allele for black eyes (dominant) and b represents the allele for orange eyes (recessive), what would be the phenotypic ratio of a cross between a heterozygous black-eyed MendAlien and an orange-eyed MendAlien?
1 black : 1 orange
The result of the following cross indicates that the genotype of the female parent is _____.
The result of the following cross indicates that the genotype of the male parent is _____.
The result of the following cross indicates that genotypically the offspring _____.
are all Rr
Which of these is a testcross?
A? x aa
That each gamete contains a single allele of the eye color gene is an illustration of _____.
Mendel's law of segregation only
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