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grigory [225]
3 years ago
6

Purpose: Does the amount of stirring affect the rate at which salt dissolves in water?

Biology
1 answer:
Rainbow [258]3 years ago
7 0
Hypothesis: If i increase the amount of string then the salt will dissolve faster
Independent variable: the amount you stir the liquid
Dependent variable: the time it takes to dissolve the salt
Materials: you need a beaker, salt, water, and a stir rod.

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4 years ago
At one gene locus in humans there are 2 alleles: one for curly hair and another for straight hair. Neither allele is dominant, a
Dovator [93]

Answer:

25%

Explanation:

<u>Genotypes and phenotypes:</u>

  • SS = straight hair
  • CC= curly hair
  • SC = wavy hair
  • AA or A0= type A blood
  • BB or B0= type B blood
  • AB = type AB blood
  • 00 = type 0 blood

A man with straight hair and A blood has the genotype SS AA or SS A0.

A woman with wavy hair and B blood has the genotype SC BB or SC B0.

Their first child has straight hair and O blood: SS 00

Because the child has type 0 blood, both parents must have a 0 allele, so their genotypes are SS A0 and SC B0.

<u>If their second child is a boy with straight hair, what is the probability that he has A blood?</u>

The hair and blood type genes are independent, so the hair phenotype of the child is irrelevant to determine the probability of him having A blood.

The parental cross for blood type is A0 x B0.

If you do a Punnett Square, you'll get the following offspring:

25% AB, 25% B0, 25% A0 and 25% 00.

The answer is the child has a probability of 25% of having A blood.

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4 years ago
According to rounding rules for addition, the sum of 27.1, 34.538, and 37.68 is ____.
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that's all wrong the real answer is b.99.3

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