Question

in eukaryotic cells, where is dna located?
a) cellular dna is spread evenly throughout the cell.
b) the majority of cellular dna is located in the nucleus, with some dna located in the mitochondria.
c) the majority of cellular dna is located in the nucleus, with some dna located in the cytoplasm for gene expression.
d) all cellular dna is located in the nucleus.
question 17 (5 points)
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two pea plants with yellow peas are crossed. most of their offspring have yellow peas, but about 25 percent of the offspring have green peas. for pea color, yellow is the dominant trait and green is the recessive trait. what does this tell you about the two parent plants?
a) the parent plants are heterozygous for pea color.
b) the parent plants are homozygous for pea color.

Explanation:

First Question (DNA location in eukaryotic cells)

In eukaryotic cells, the nucleus is the primary location for most DNA (organized as chromosomes). Mitochondria (and chloroplasts in plant cells) also contain their own circular DNA (mtDNA) due to endosymbiotic theory. Option A is wrong as DNA isn’t spread evenly. Option C is wrong because DNA isn’t in cytoplasm for gene expression (RNA is transcribed in nucleus, translated in cytoplasm). Option D is wrong as mitochondria have DNA too.

Second Question (Pea plant genetics)

Let the allele for yellow be \( Y \) (dominant) and green be \( y \) (recessive). If parents are heterozygous (\( Yy \times Yy \)), the Punnett square gives genotypes \( YY, Yy, Yy, yy \). Phenotypes: \( YY \) and \( Yy \) are yellow (75%), \( yy \) is green (25%), matching the offspring ratio. If parents were homozygous dominant (\( YY \times YY \)), all offspring would be \( YY \) (yellow). If homozygous recessive (\( yy \times yy \)), all would be green. So heterozygous parents explain the 25% green (recessive) offspring.

Answer:

B) The majority of cellular DNA is located in the nucleus, with some DNA located in the mitochondria.