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4 years ago

Similarities between humans and snails.

Biology

1 answer:

Gennadij [26K]4 years ago

4 0

Answer:

Explanation:

Biologists have tracked down genes that control the handedness of snail shells, and they turn out to be similar to the genes used by humans to set up the left and right sides of the body.

The finding, reported online in advance of publication in Nature by University of California, Berkeley, researchers, indicates that the same genes have been responsible for establishing the left-right asymmetry of animals for 500-650 million years, originating in the last common ancestor of all animals with bilateral body organization, creatures that include everything from worms to humans.

"Previous studies indicated that the methods for breaking left-right symmetry in animals seem to differ widely, so there was nothing suggesting that the common ancestor of humans, snails and other bilateral organisms had a common strategy for left-right asymmetry," said Nipam H. Patel, UC Berkeley professor of integrative biology and of molecular and cell biology, and an investigator of the Howard Hughes Medical Institute.

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How does crossing over mix up alleles from your paternal and maternal chromosomes:

wariber [46]

Answer:

b. it involves a physical exchange of segments from homologous chramosomes.

Explanation:

Crossing is a phenomenon involving homologous chromatids. It consists of the breaking of these chromatids at certain points, followed by an exchange of corresponding pieces between them.

Exchanges cause new gene sequences to appear along the chromosomes. Thus, if on a chromosome there are several genes combined in a certain sequence, after the occurrence of crossing the combination may no longer be the same. So when thinking about crossing, it is common to analyze what would happen, for example, about the combination of the allele genes "A" and "a" and "B" and "b" in the pair of homologues.

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3 years ago

When a skeletal muscle relaxes, what causes the myosin cross-bridges to separate and the thin filaments to return to their origi

Rina8888 [55]

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4 years ago

Read 2 more answers

What is the key element found in co2 and glucose

Varvara68 [4.7K]

Hey there!
Carbon is the key element found in co2 and glucose.

Hope this helps!
Have a great day! (:

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4 years ago

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What are the advantages of plants all producing flowers at the same time?

Zepler [3.9K]

Answer:

more likely chance that a bee will take pollen from one flower to another pollinating the flowers.

Explanation: birb

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3 years ago

Question7:Indicate whether the following statements are TRUE or FALSE. If a statement is false, explain why it is false.A. DNA m

Vikentia [17]

Answer:

A. FALSE

B. TRUE

C. FALSE

D. FALSE

Explanation:

A. DNA molecules consist of two strands of a helical chain of nucleotides, which are the monomer subunits of DNA.

B. Nucleotide subunits that make up a DNA strand are polar due to the presence of the phosphate group per subunit.

C. There are only four different nucleotides in a DNA strand. The nucleotides are different from each other based on the four nitrogen bases. These are adenine, thymine, cytosine, and guanine.

D. Hydrogen bonds are present between the nitrogen bases of nucleotides from anti-parallel DNA strands. Phosphodiester bonds, on the other hand are present between nucleotides of an individual DNA strand thus holding one DNA molecule together.

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3 years ago