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3 years ago

Do annelids have internal or external shell?

Biology

2 answers:

ella [17]3 years ago

7 0

Annelids have either internal nor external shell

n200080 [17]3 years ago

6 0

Annelids have neither an external or an internal shell. Examples of annelids are

earthworms and leeches.

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Which of these is an example of an adaptation?

Evgen [1.6K]

Answer to your question is D

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3 years ago

Which is the result of meiosis II? A. two diploid daughter cells B. four diploid daughter cells C. two haploid daughter cells D.

snow_tiger [21]

The answer to your question is,

D. Four haploid daughter cells.

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3 years ago

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Which organism was most likely to live at the same time as brachiopods?

beks73 [17]

The organism that was most likely to live at the same time as brachiopods were
Trilobites

Brachiopods were like lamshells. They lived underwater, had soft bodies and their shells were bivalves.
Trilobites had three-lobed bodies. They could swim, crawl, and burrow.

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2 years ago

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A man with normal vision marries a color-blind woman. Red-green color blindness is an X- linked recessive disorder. They have a

jeyben [28]

Answer: The probability is 100%.

Explanation: The chromosome X is related to gender. A man carries two different chromosomes (XY) and a woman carries two similar chromosomes (XX). The offspring of a couple will inherited:

If it is a boy, he inherites the chromosome Y from his father and X from his mother;
If it a girl, she inherites X from her father and X from her mother;

In the question, the woman is color-blind, which means she carries the recessive alleles: $X^{d}X^{d}$

The man, on the other hand, is normal, so his X-linked genotype will be: $X^{D}Y$ .

Now, since they have a daughter, she inherited her double X from each of her parents, which means she inherited one $X^{d}$ from her mother and one $X^{D}$ from her father.

So, the daughter's genotype can only be heterozygotic $X^{D}$ $X^{d}$ in other words, the probability is 100%.

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3 years ago

The genetic condition of an organism that has two identical alleles for a given trait.

NikAS [45]

"An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene. An organism which has two different alleles of the gene is called heterozygous."

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3 years ago