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REY [17]
4 years ago
9

Why are agar plates turned upside down when incubated?

Biology
2 answers:
Nikolay [14]4 years ago
6 0
Before they are inoculated and incubated<span>, </span>agar plates<span> are </span>turned upside down<span> so that any condensation that might be present on the lid does not drip </span>down<span> into the culture medium.</span>
Black_prince [1.1K]4 years ago
4 0
They are turned upside down because there might be condensation on the lid and turning it upside down would prevent it from dripping into the culture medium.
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Answer:

The parent's genotypes are:

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ddPp - dwarf, purple parent.

Explanation:

This question involves two different genes coding for height and flower color in pea plants. The alleles for tallness (D) and purple color (P) are dominant over the alleles for dwarfness (d) and white color (p) respectively.

According to this question, a tall plant with white flowers is crossed with a dwarf plant with purple flowers to produce the following proportion of offsprings: 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white.

Since some of the offsprings contain recessive alleles for both or either genes, the dominant traits of the parent is controlled by an heterozygous genotype. This means that the tall plant with white flowers has a genotype: Ddpp while the dwarf plant with purple flowers has the genotype: ddPp. In a cross between Ddpp × ddPp, 1/4 of each combination of alleles is produced in the offsprings (see punnet square in the attachment).

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3 years ago
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False

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2 years ago
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