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ch4aika [34]
4 years ago
14

Down's syndrome is a condition where an extra chromosome is produced on the _____ chromosome.

Biology
1 answer:
frez [133]4 years ago
5 0
Down;s syndrome is also known as trisomy 21 because it is caused by an additional copy of chromosome 21. The correct answer is the third one: 21st.
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A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population con
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Answer:

Option C

Explanation:

Given ,

A1 allele is carried by 70 % people

Let us assume A1 s dominant genotype

This means p= \frac{70}{100} = 0.7

Thus, frequency of allele in the given population is 0.7

It is also given that the population is in Hardy-Weinberg equilibrium thus

p+q=1\\0.7+q=1\\q = 1-0.7\\q= 0.3

Frequency of fruit fly with genotype A2A2 will be

q^2\\= (0.3)^2\\= 0.09

As per Hardy-Weinberg's second equation of equilibrium

p^{2} + q^{2} + 2pq = 1\\0.49+0.09+2pq = 1\\2pq = 1-0.49-0.09\\2pq= 0.42

Hence, option C is correct

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3 years ago
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B, because if you think about it, you're climbing a mountain and the mountain is at a very high elevation right? it is very cold and the pressure of the air is high. now when you go down, it gets warmer and the pressure isn't as bad.
4 0
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