Awhite dog is crossed with a heterozygous black dog. what are the pearents genotype ? and what percentage of the offspring will be black ?

The black heterozygous dog has the genotype "Aa" and the white dog has the genotype "aa". A cross between these two dogs (Aa x aa) would generate an offspring of 50% Aa (black coat) and 50% aa (white coat).

Explanation:

Heterozygous organisms have the characteristic of the dominant allele, so we can say that the black dog shown in the question above has the "Aa" alleles in its genome. As black fur is a dominant characteristic, we can consider the white dog as a homozygous recessive dog, therefore it has the "aa" genotype. If we crossed these two dogs we would have an "Aa x aa" type crossing that would result in an offspring with the genotypes "Aa", "aa", "Aa", "aa". In this case, 50% of the offspring have the "Aa" genotype and 50% of the offspring have the "aa" genotype.

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)