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Degger [83]
3 years ago
11

2. All of the following are true of crossing over, EXCEPT

Biology
1 answer:
Ira Lisetskai [31]3 years ago
4 0

Answer:

Option (1)

Explanation:

Meiosis is also known as reduction division. Meiosis is the process of cell division by which a  parent cell divides to give four daughter cells each with half number of chromosomes.

Crossing over may occur during meiosis I of the cell cycle. Crossing over will not occur in the cells immediately after the fertilization of egg and zygote restores the original number of chromosomes.

Thus, the correct answer is option (1).

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A point mutation changes the DNA sequence CGA to CGT, but the same protein is still produced. Which point mutation occurred? A.
iren [92.7K]
The answer is <span>C.silent.

Nonsense, missense, silent, and frameshift mutations are point mutations. The point mutations are the change in a single nucleotide base on the DNA molecule. In a missense mutation, the change in a single nucleotide base results in a codon coding for a different amino acid. In a nonsense mutation, the change in a single nucleotide results in a stop codon or in a nonsense codon. Frameshift mutation, due to addition or deletion of a base, results in the change of reading frame and totally different translation. In all these cases, the change could lead to different of nonfunctional protein translation.
Silent mutation, on the other, means that change in a nucleotide base will no affect amino acid. It will result in a different codon, but the one that code for the same amino acid, so the same protein will be produced.

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7 0
3 years ago
Read 2 more answers
PLEASE HELP!! im despratte
Alex73 [517]

Answer:

Template strand = complementary strand

GCA AG = CGT TC

TTA CG = AAT GC

GAT AC = CTA TG

CGG AT = GCC TA

DNA strand = mRNA strand

CGA TT = GCU AA

GCT TA = CGA AU

GCA TC = CGU AG

TTC AT = AAG UA

It is more important for DNA replication to be exact than transcription or translation because any error that occurs during DNA replication if not repaired will become permanent and will be transferred to the next generation.

Explanation: In DNA base pairing, G pairs with C and T pairs with A. But in RNA base pairing, G pairs with C and U pairs with A. DNA contains four bases G, C, T and A while RNA contains four bases G, C, A and U.

See the attached file

5 0
3 years ago
When cells were first taken from henrietta lacks, she was _____. mastering biology?
Bond [772]
The correct answer is that "she was suffering from cervical cancer".

Henrietta Lacks was known to be <span>an African-American </span>female<span> whose </span>cancer<span> cells are the </span>source<span> of the HeLa </span>cellular<span> line, </span>the primary<span> immortalized </span>cellular<span> line and </span>one of the most important cellular lines<span> in </span>scientific studies<span>. An immortalized </span>cell<span> line will reproduce indefinitely </span>beneath particular conditions<span>, and the HeLa </span>cell<span> line </span>continues to be<span> a </span>source<span> of </span>helpful clinical records<span> to the </span><span>contemporary</span>
6 0
3 years ago
Explain why the cane toad was a failure as a biological control method in Australia.
kakasveta [241]
The cane toad was a failure as a biological control method in Australia because:
-The greyback beetle it was supposed to be eating fed at the top of the sugarcane stalks (which were 6-8 meters in height). Cane toads cannot fly or climb and therefore couldnt feed on the beetles.
-The beetles were out during the daytime, and cane toads feed at night.
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-The cane toad eats many native species and often out-competes native species for food and breeding sites, leading to the decline of natives.
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7 0
3 years ago
Which of the following groups of organs provide secretions that nourish and protect sperm cells?
Hitman42 [59]

Answer: Seminal vesicles, Cowper's glands, and the prostate gland

Explanation:

Seminal vesicles make a sugary secretion that nourishes the sperm cells. Cowper's glands and the prostate work together to create secretions that protect the cells.

8 0
2 years ago
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