Which allele, dominant or recessive declined in frequency more quickly when wolves displayed a taste for pigs with the associated phenotype? A. The dominant allele declined in frequency more quickly B. The recessive allele declined in frequency more quickly. C. Both alleles declined in frequency at about the same rate.
Key Terms
Pigeons s have two alleles of a single gene that determines whether they have feathers on their lower legs. The alleles are called no grouse (associated with the featherless phenotype) and grouse (associated with feathery legs).
Q4.2. Suppose a pigeon that is homozygous for the grouse allele mates with a heterozygous pigeon. What is the expected frequency of the homozygous no grouse genotype In the offspring?
A. 0%
B. 50%
C. 75%
D. 100%
B
Pigeons s have two alleles of a single gene that determines whether they have feathers on their lower legs. The alleles are called no grouse (associated with the featherless phenotype) and grouse (associated with feathery legs).
The no grouse allele is dominant over the grouse allele. If a pigeon homozygous for the grouse allele mates with a heterozygous pigeon, what is the expected frequency of the feathery-legged (grouse) PHENOTYPE in the offspring?
A. 0%
B. 50%
C. 75%
D. 100%
B
In a certain species of flowering plant, the allele for red petal color is dominant and the allele for white petal color is recessive. If you mated a homozygous red flower with a homozygous white flower, what would you expect the offspring to look like?
A. All offspring will have red petals
B. All offspring will have pink petals
C. All offspring will have white petals
D. Half of the offspring will have red petals and the other half will have white petals
A
A scientist came across two populations of beetle species, each pure-breeding. One population was all red in color; the other was all black. The scientist mated one red beetle with one black beetle, and the offspring were all black. What is the dominance relationship between the two alleles?
A. Black is dominant over red
B. Red is dominant over black
C. Black and red are codominant
D. More crosses are needed to determine the dominance relationship
A
Related Flashcard Decks
Study Tips
- Press F to enter focus mode for distraction-free studying
- Review cards regularly to improve retention
- Try to recall the answer before flipping the card
- Share this deck with friends to study together
| Term | Definition |
|---|---|
Which allele, dominant or recessive declined in frequency more quickly when wolves displayed a taste for pigs with the associated phenotype?
A. The dominant allele declined in frequency more quickly
B. The recessive allele declined in frequency more quickly.
C. Both alleles declined in frequency at about the same rate. | A |
Suppose a gene has two alleles, one which is dominant over the other. An individual whose genotype is heterozygous for the dominant allele has which of the following?
A. Two copies of the allele that determines phenotype whenever the allele is present.
B. Two copies of the allele whose effect is hidden unless the other allele is absent.
C. One copy of the allele that determines phenotype when present and one copy of the other allele
D. One copy of each of two alleles that both contribute equally to determine phenotype. | C |
Pigeons s have two alleles of a single gene that determines whether they have feathers on their lower legs. The alleles are called no grouse (associated with the featherless phenotype) and grouse (associated with feathery legs). Q4.2. Suppose a pigeon that is homozygous for the grouse allele mates with a heterozygous pigeon. What is the expected frequency of the homozygous no grouse genotype In the offspring? A. 0% B. 50% C. 75% D. 100% | B |
Pigeons s have two alleles of a single gene that determines whether they have feathers on their lower legs. The alleles are called no grouse (associated with the featherless phenotype) and grouse (associated with feathery legs). The no grouse allele is dominant over the grouse allele. If a pigeon homozygous for the grouse allele mates with a heterozygous pigeon, what is the expected frequency of the feathery-legged (grouse) PHENOTYPE in the offspring? A. 0% B. 50% C. 75% D. 100% | B |
In a certain species of flowering plant, the allele for red petal color is dominant and the allele for white petal color is recessive. If you mated a homozygous red flower with a homozygous white flower, what would you expect the offspring to look like? | A |
A scientist came across two populations of beetle species, each pure-breeding. One population was all red in color; the other was all black. The scientist mated one red beetle with one black beetle, and the offspring were all black. What is the dominance relationship between the two alleles? | A |
A large sunflower population is established in a field. The flowers mate randomly, and all individuals are equally likely to survive and reproduce. In this population, 60% of the alleles of a gene for petal color are dominant and 40% of the alleles are recessive. Given this information, after many generations, which of the following options would be most likely? | C |
A lizard population has two alleles for horn length. Long horns help protect the lizard from predation by birds. Homozygotes with allele 1 have long horns, while homozygotes with allele 2 have short horns. Given this information, which of the following is most likely true about the mode of inheritance for allele 1, and why? | D |
The allele for black noses in wolves is dominant over the allele for brown noses. There is no known selective advantage for one nose color over another in wolves. If this remains true, which of the following statements is most likely TRUE about the change in wolf nose colors over many generations? | B |
A large population of land turtles on an isolated island has two alleles for a gene that determines shell thickness. The allele for thinner shells is dominant over the allele for thicker shells. The thinner-shell allele occurs at a frequency of 20%. Assuming there is no net advantage to thick or thin shells, what should the frequency of homozygous thicker shelled turtles be in the population? (Hint: Use a large Punnett square to calculate the answer). | D |