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Goshia [24]
3 years ago
14

The period of the embryo begins atand ends withwhich takes about

Biology
1 answer:
Inga [223]3 years ago
7 0

Answer:

The first 2 weeks of development is the germinal period. The germinal period begins with conception and ends when the blastocyst is fully placed into uterine tissue. Next, the embryonic period lasts from implantation until about 8 weeks from the time of conception.

Explanation:

The third thru the eighth  week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.

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Explanation:

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Answer: 1/16, or approximately 6.25% (see explanation below)

Explanation:

Answering this question requires two steps.

First, we need to figure out the probability that this couple will have a child with albinism in the first place. We know the following:

- Both parents are unaffected.

- The couple has already had one affected child.

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Let ( M = normal gene ) and ( m = mutated gene ). Since the condition is recessive, the affected child can be assumed to have a “mm” genotype. Barring the possibility of a de novo mutation (which are assumed to be rare), the affected child must have inherited one ”m” allele from each parent. Since both of them are unaffected, however, we can assume that they are both carriers (genotype “Mm”). In conclusion, 1/4 of their offspring (25%) <em>for any given pregnancy</em> may be expected to have albinism. See the resulting Punnett square:

<u>       |      M    |      m   </u>

<u>M    |    MM   |    Mm  </u>

<u>m    |    Mm   |    mm  </u>

Note that the question asks about the probability that not one but two consecutive births result in affected children. Since it can be assumed that both events are independent (meaning: the outcome of a pregnancy does not influence the outcome of following ones), we may apply the rule of multiplication for probabilities. The final answer is therefore 1/4 * 1/4 = 1/16.

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