Question 1:

We have:

• A pure breeding plant with purple seeds → genotype: PP (if P = purple).

• It fertilizes a plant from a yellow seed → but we need to determine if yellow is recessive or dominant to purple.

• All the seeds produced from this cross (F1 generation) were purple.

That means crossing PP (pure purple) with yy (if y = yellow allele, recessive) would give: F1 = Py → all purple if purple is dominant.

If yellow were dominant instead, crossing PP (purple) with YY (yellow) would produce PY (yellow, since Y is dominant) — but the F1 gave all purple, so that’s not possible.

Therefore purple is dominant.

Answer: B. Purple ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

Let's reason this through step by step.

Step 1: Recall the F1 genotype from the first cross

• Parent 1: Pure purple seeds → PP (P = purple, dominant)

• Parent 2: Grown from a yellow seed → genotype must be pp (since yellow is recessive and appears only if both alleles are recessive; the parent came from a yellow seed, meaning pp).

• Cross PP × pp → F1 all Pp (heterozygous, all purple seeds).

Step 2: F1 self-cross
F1 = Pp × Pp (both plants have purple seeds but carry the yellow recessive allele).

Step 3: Punnett square for Pp × Pp

Genotypes:

• PP (purple) → 1/4

• Pp (purple) → 2/4

• pp (yellow) → 1/4

Step 4: Phenotypes ratio
Purple = PP + Pp = 3/4
Yellow = pp = 1/4
Ratio = 3 purple : 1 yellow

From the options:
3 purple : 1 yellow = 1 yellow : 3 purple (same ratio, just reversed order words).

So the matching answer is C. 1 yellow: 3 purple.

Answer: C ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

We’re told:

• Albinism is caused by a recessive allele a.

• Dominant allele A gives normal pigmentation (brown).

• An albino rabbit lacks pigment → so it must have only recessive alleles (aa).

Options:

• A. AA → brown (not albino) ❌

• B. Aa → brown (carrier, not albino) ❌

• C. aa → albino ✅

• D. aA → same as Aa, brown ❌

Answer: C. aa ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

We know:

• Albinism = recessive allele a

• Heterozygous genotype = Aa (brown, but carries albino allele)

Step 1: Cross
Two heterozygous rabbits: Aa × Aa

Step 2: Punnett square

Step 3: Offspring genotypes

• AA → 1/4 (brown)

• Aa → 2/4 (brown, carrier)

• aa → 1/4 (albino)

Step 4: Proportion albino
Albino (aa) = 1/4 = 25%

Answer: A. 25% ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

We’re still looking at the Aa × Aa cross (see Q4 answer).

From the Punnett square:

• AA = 1/4 (homozygous dominant for brown fur)

• Aa = 2/4 (heterozygous brown)

• aa = 1/4 (albino)

Homozygous dominant = AA = 1/4 = 25%

Answer: D. 25% ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

Answer: A. 0%

Reasoning: Sam’s father is a "male not carrier" (empty square, genotype FF) and his mother is a "carrier female" (half-shaded circle, genotype Ff). To have cystic fibrosis (a recessive disorder), Sam would need to inherit a recessive allele (f) from both parents. Since his father has no recessive alleles to give, Sam cannot have the disorder.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

Answer: C. 50%

Reasoning: Using a Punnett square for the parents (FF x Ff): 50% of offspring will be FF (not a carrier). 50% of offspring will be Ff (carrier).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Answer: D. female but may or may not be a carrier

Reasoning: Jane’s mother is "female not carrier" (FF) and her father is a "carrier male" (Ff). Just like Sam's situation, the offspring of this match have a 50% chance of being a carrier (Ff) and a 50% chance of being a non-carrier (FF). Since the pedigree marks Jane with a "?" and an unshaded circle, we know she is female and does not have the disease, but her carrier status is unknown.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Let's check each option against the definition of a mutation in biology:

• A. a frequent random change in the DNA that can be inherited → Mutations are not "frequent," they are rare. ❌

• B. a rare random change in the DNA that cannot be inherited → Some mutations are in body cells (somatic) and not inherited, but the question seems to refer to a mutation that could cause cystic fibrosis (a genetic disease), which means it can be passed to offspring. So this partly fits, but it says “cannot be inherited,” which is incorrect for germline mutations. ❌

• C. always bad, causing harm to the organism → Not always bad; some mutations are neutral or beneficial. ❌

• D. a rare random change in the DNA that can be inherited → This is the correct definition for a heritable mutation (germline mutation). ✅

Answer: D. a rare random change in the DNA that can be inherited. ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

Let's recall known mutagens (agents that cause mutations):

• A. UV radiation → known mutagen (causes thymine dimers in DNA) → can cause mutations ✅

• B. caffeine → not considered a direct mutagen; in some test systems it may affect DNA repair, but it’s not classified as a strong, direct DNA-damaging agent → unlikely to cause mutation directly ❌

• C. nicotine → studies show it can cause DNA damage indirectly (oxidative stress, etc.) → can be mutagenic in some contexts ✅

• D. X-rays → ionizing radiation, strong mutagen ✅

Among these, caffeine is the one not typically listed as a direct mutagen; it’s more of a stimulant.

Answer: B. caffeine ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.