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3 years ago

Jeff's genome contains a recessive gene for cystic fibrosis. jeff is said to be a ______ of the gene for cystic fibrosis.

1 answer:

3 0

Jeff is said to be a carrier of the gene.
Recessive genes are those that appear in an organism's phenotype when there are two copies of the allele present. Some organisms have one copy of the dominant allele and one copy of the recessive allele, as is the case with Jeff. These organisms carry the allele and may pass it down to their offspring.

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Tumors of the parathyroid gland often result in secretion of excess parathyroid hormone. Considering the function of this hormon

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Parathyroid hormone increases the level of calcium while calcitonin hormone decreases the level of calcium in the blood.

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Based on the organisms’ names, what can be concluded about the relation of each species to one another?

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3 years ago

A population of 100 tigers has 30 with horizontal stripes. Using pedigrees, you ascertain that horizontal striping is caused by

bixtya [17]

Assuming that this population is in Hardy-Weinberg equilibrium, we can sayt that the probability that, given enough time, all tigers in the population will have horizontal stripes is 30% = 0.3.

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Available data:

Population size, N = 100 tigers
Number of Tigers with horizontal stripes = 30
Horizontal stripes is caused by an autosomal recessive mutation.

We need to know the probability that all tigers in the population will have horizontal stripes, which is the recessive phenotype.

We assume that the population is in Hardy-Weinberg equilibrium, so there should be no evolution.

Since the population is in H-W equilibrium, the allelic, genotypic and phenotypic frequencies will remain the same generation after generation.

Now, we will calculate the allelic and genotypic frequencies of horizontal striped individuals in the population.

There are 100 individuals, and only 30 have horizontal stripes.

So, the phenotypic frequency, F(HS) is 30/100 = 0.3 = 30%

Since this is a recessive phenotype, this value equals the genotypic frequency, F(hh) = 30%

Finally, we can get the allelic frequency by taking the square root of this value.

F(hh) = q² = 0.3

f(h) = q = √0.3 = 0.55 = 55%

According to these calcs, the probability for the fixation of the recessive allele is 55%, and the probability that all individuals express the recessive horizontal stripes phenotype is 30%.

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You can learn more about Hardy-Weinberg equilibrium at

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