Question

black labrador, dominant expression \big\
above is a punnett square tracing the possible offspring of a chocolate labrador and a black labrador.
which of the following statements is true about the offspring of this litter of labrador puppies?
a since the one parent has dominant traits and the other parent has recessive traits, only the dominant trait can be transmitted; all the puppies are black.
b since the one parent has dominant traits and the other parent has recessive traits, only the recessive trait can be transmitted; all the puppies are chocolate.
c since the one parent has dominant traits and the other parent has recessive traits, it is possible in to have both black and chocolate puppies since the dominant parent is heterozygous dominant.
(c) punnett squares
punnett squares can be used to track more than one trait in an organism and determine if different genes affect each other.

Explanation:

To solve this, we analyze Punnett Square genetics:

• A dominant trait (e.g., black in Labradors) is expressed if at least one dominant allele is present. A recessive trait (chocolate) requires two recessive alleles.
• If one parent is heterozygous dominant (carrying one dominant and one recessive allele) and the other is recessive, both traits can appear. But in the given options, we check the logic:
• Option A: Incorrect. Recessive traits can be transmitted if the dominant parent is heterozygous (carries the recessive allele).
• Option B: Incorrect. Dominant traits from the dominant parent would also be transmitted.
• Wait, the visible option (likely a typo in the user’s image, but assuming the correct logic: If the dominant parent is heterozygous (has a recessive allele), both black (dominant) and chocolate (recessive) puppies are possible. But among the given options, the intended correct one (likely a misformatted option, but from standard Punnett Square logic) – however, re - evaluating the visible options: The option with “it is possible to have both black and chocolate puppies since the dominant parent is heterozygous dominant” (even if phrased roughly) is correct. But from the visible options, if we assume the third option (C) is the one with that logic, we proceed.

Answer:

C. Since the one parent has dominant traits and the other parent has recessive traits, it is possible to have both black and chocolate puppies since the dominant parent is heterozygous dominant.