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Leona [35]
3 years ago
12

People with Down syndrome usually have ______ of the 21st chromosome.

Biology
2 answers:
Ivahew [28]3 years ago
7 0
People with Down syndrome usually have trisomy of the 21st chromosome.
Elena-2011 [213]3 years ago
6 0
It is caused by a trisomy in the 21st chromosome 
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neonofarm [45]
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Flower color in snapdragons results from the amount of the pigment anthocyanin in the petals. Red flowers are produced by plants
USPshnik [31]

Answer:

The genotypes found in the F2 offspring will be An1An1, An1An2 and An2An2.

Explanation:

In the example given in the question, the color of the petals of snapdragon flowers are given with the An1 allele having full activity and the An2 allele being the null allele. For the F1 offspring, two snapdragon flowers are crossed, one with red petals which is An1An1 and one with ivory petals which is An2An2. All the genotypes for the F1 offspring will result in An1An2.

Then using this F1 offspring, the F2 offspring is found and the genotype of the F2 offspring will be An1An1 / An1An2 / An1An2 / An2An2.

So the genotypes found in the F2 offspring will be An1An1, An1An2 and An2An2. One red petal snapdragon, 1 ivory snapdragon and 2 pink snapdragons.

I hope this answer helps.

8 0
3 years ago
Which of the following is not a component of soil?
melisa1 [442]

The answer is none of the above because organic materials, gasses, and minerals are all component soils.

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Which of the following is an important part of scientific methods? Select all correct answers.
timofeeve [1]

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Making a hypotheses and performing experiments

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Explanation:

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