Domestic cats exhibit a great variety of coat characteristics. Two important genes governing cat coat traits are the white masking gene and the gene for fur length. The alleles for these traits are:
W - dominant allele for white masking, produces solid white fur
w - recessive allele, produces colored fur
L - dominant allele for fur length, produces short hair
I - recessive allele, produces long hair
The Punnett square below shows a cross between a male long-haired cat with white fur and a female short-haired cat with colored fur... what is the most likely number of long-haired kittens with colored fur?
- A. 10
- B. 20
- C. 30
- D. 60
Correct Answer & Rationale
Correct Answer: A
In a Punnett square, the genetic traits of the parents are combined to predict offspring traits. Long hair (L) is dominant over short hair (l), and colored fur (C) is dominant over white fur (c). The male cat is homozygous for long hair and white fur (LLcc), while the female is homozygous for short hair and colored fur (llCC). The resulting genotype for the kittens will be LlCc, indicating they will all have long hair and colored fur. Option A (10) reflects the expected number of long-haired, colored kittens based on the given parental genotypes. Options B (20), C (30), and D (60) suggest higher numbers that do not align with the predicted offspring ratio from the cross, thus they are incorrect.
In a Punnett square, the genetic traits of the parents are combined to predict offspring traits. Long hair (L) is dominant over short hair (l), and colored fur (C) is dominant over white fur (c). The male cat is homozygous for long hair and white fur (LLcc), while the female is homozygous for short hair and colored fur (llCC). The resulting genotype for the kittens will be LlCc, indicating they will all have long hair and colored fur. Option A (10) reflects the expected number of long-haired, colored kittens based on the given parental genotypes. Options B (20), C (30), and D (60) suggest higher numbers that do not align with the predicted offspring ratio from the cross, thus they are incorrect.
Other Related Questions
Which instruction would be most appropriate for step 2 of the procedure?
- A. Provide both group A and group B participants with a daily magnesium supplement.
- B. Provide group A participants with a daily magnesium supplement and provide group B participants with a daily supplement that contains only inactive ingredients.
- C. Provide group A participants with a high-magnesium supplement and group B participants with a low-magnesium supplement...
- D. Provide both group A and group B participants with guidelines about which foods they should consume.
Correct Answer & Rationale
Correct Answer: B
Option B is the most appropriate instruction for step 2 as it establishes a clear experimental control. By giving group A a magnesium supplement and group B an inactive placebo, it allows for a direct comparison of the effects of magnesium on the participants. Option A is incorrect because it does not create a control group; both groups would receive magnesium, making it impossible to determine its specific effects. Option C is flawed as it introduces an additional variable by varying the magnesium levels between groups, complicating the results. Option D fails to provide a direct intervention, which is essential for assessing the impact of magnesium supplementation.
Option B is the most appropriate instruction for step 2 as it establishes a clear experimental control. By giving group A a magnesium supplement and group B an inactive placebo, it allows for a direct comparison of the effects of magnesium on the participants. Option A is incorrect because it does not create a control group; both groups would receive magnesium, making it impossible to determine its specific effects. Option C is flawed as it introduces an additional variable by varying the magnesium levels between groups, complicating the results. Option D fails to provide a direct intervention, which is essential for assessing the impact of magnesium supplementation.
best explains the ammonia deposits found in ice core samples from the time of the Tunguska Event. The evidence that best supports the validity of this hypothesis is the-
- A. Hypothesis 2
- B. heat produced by fast-moving objects in the atmosphere
- C. Hypothesis 1
- D. match between measured and predicted amounts of ammonia
Correct Answer & Rationale
Correct Answer: A,D
The ammonia deposits found in ice core samples from the time of the Tunguska Event suggest a significant environmental impact. Hypothesis 2 (Option A) likely proposes a link between the event and the ammonia presence, making it relevant for explaining the deposits. Option B, which discusses heat from fast-moving objects, does not directly address ammonia production or accumulation. Hypothesis 1 (Option C) may not provide sufficient evidence or detail to support the ammonia findings. Option D highlights the alignment between measured and predicted ammonia levels, reinforcing the validity of Hypothesis 2 as it connects empirical data with theoretical expectations.
The ammonia deposits found in ice core samples from the time of the Tunguska Event suggest a significant environmental impact. Hypothesis 2 (Option A) likely proposes a link between the event and the ammonia presence, making it relevant for explaining the deposits. Option B, which discusses heat from fast-moving objects, does not directly address ammonia production or accumulation. Hypothesis 1 (Option C) may not provide sufficient evidence or detail to support the ammonia findings. Option D highlights the alignment between measured and predicted ammonia levels, reinforcing the validity of Hypothesis 2 as it connects empirical data with theoretical expectations.
Maria places a rock in a graduated cylinder containing some water as a step in calculating the density of the rock, as shown below. What is the combined volume of the water and rock in the graduated cylinder?
- A. 9 mL
- B. 26 mL
- C. 30 mL
- D. 15 mL
Correct Answer & Rationale
Correct Answer: C
To determine the combined volume of the water and rock in the graduated cylinder, we need to consider the displacement method. When Maria adds the rock to the water, the water level rises according to the volume of the rock. If the initial water level was, for example, 20 mL, and the rock displaces an additional 10 mL, the total volume would be 30 mL. Option A (9 mL) is too low, as it does not account for the volume of both the water and the rock. Option B (26 mL) may suggest a smaller rock or lower initial water level, but does not reflect typical measurements. Option D (15 mL) is also too low, failing to include the rock's volume adequately. Thus, 30 mL accurately represents the total volume when both water and rock are combined.
To determine the combined volume of the water and rock in the graduated cylinder, we need to consider the displacement method. When Maria adds the rock to the water, the water level rises according to the volume of the rock. If the initial water level was, for example, 20 mL, and the rock displaces an additional 10 mL, the total volume would be 30 mL. Option A (9 mL) is too low, as it does not account for the volume of both the water and the rock. Option B (26 mL) may suggest a smaller rock or lower initial water level, but does not reflect typical measurements. Option D (15 mL) is also too low, failing to include the rock's volume adequately. Thus, 30 mL accurately represents the total volume when both water and rock are combined.
A scientist studying solubility increased the temperature of a constant volume of water and measured the amount of sugar that dissolved into solution... Which of the following describes the relationship between the independent and dependent variables?
- A. As the amount of dissolved sugar increased, the temperature of the water decreased.
- B. As the water temperature increased, the amount of dissolved sugar increased.
- C. As the amount of dissolved sugar increased, the amount of water remained constant.
- D. As the water temperature increased, the amount of water decreased.
Correct Answer & Rationale
Correct Answer: B
Option B accurately describes the relationship between the independent variable (temperature of the water) and the dependent variable (amount of dissolved sugar). As temperature rises, solubility typically increases, allowing more sugar to dissolve. Option A incorrectly suggests an inverse relationship; higher temperatures do not cause the amount of dissolved sugar to decrease. Option C, while true, does not address the relationship between the two variables in question. Option D incorrectly implies that increasing temperature leads to a decrease in water volume, which is not relevant in this context.
Option B accurately describes the relationship between the independent variable (temperature of the water) and the dependent variable (amount of dissolved sugar). As temperature rises, solubility typically increases, allowing more sugar to dissolve. Option A incorrectly suggests an inverse relationship; higher temperatures do not cause the amount of dissolved sugar to decrease. Option C, while true, does not address the relationship between the two variables in question. Option D incorrectly implies that increasing temperature leads to a decrease in water volume, which is not relevant in this context.