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3 years ago

Why are unused embryos available? How could they be used in medical research?

Biology

1 answer:

coldgirl [10]3 years ago

6 0

Answer:

Why are embryos used in medical research?

Stem cells can be obtained at the early stages of embryo development; these cells are called human embryonic stem cells (hESC). They also could be used in research to develop drugs to treat serious diseases, or to repair organs following a stroke or heart attack.

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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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6 0

2 years ago

A tapeworm attaches to the inner intestinal wall of a black bass and absorbs nutrients from the fish's food. What is the relatio

Lunna [17]

Answer:

Explanation:

in a relationship a parasite is described as the member who greatly benefits in the relationship at the other's expense.

Like riding a stubborn horse, when it bucks you off, it gets the pleasure from doing so, but you end up with a broken foot.

The host is who hosts the other, and the tapeworm is attaching itself to a host so the answer must be A

cannot be b since no proof of that relationship, in both c and d the bass is caused harm so it is not mutual or beneficial to the bass in any way

i hope this helps u!

pls give a brainliest and a thx ;)

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3 years ago

In what way is DNA like a book?

Alekssandra [29.7K]

A book contains letters, just like the DNA. It's how the letters are arranged-into words in a book- that makes them mean anything. The same is true of DNA bases. It is how they are arranged that makes them significant.

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2 years ago

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What is the sweet substance made by bees?

brilliants [131]

Honey is the sweet substance made by bees.

Hope this helps. :)

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3 years ago

When did the first humans appear on earth

Hitman42 [59]

66 million years ago

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3 years ago