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MariettaO [177]
3 years ago
14

Cross-over involves the exchange of genetic information between

Biology
1 answer:
Ksju [112]3 years ago
3 0

2 Homologous chromosomes in meiosis, and then replicate into sister chromatids.

Hope this helps, ( or is clear enough ) if not, comment below please!!!!

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How can two organisms with a dominant trait for a specific feature produce an organism with a recessive trait for the same featu
Liono4ka [1.6K]

Answer:

If the two organisms are heterozygous for the dominant trait.

Explanation:

For every trait, a diploid organism receives two forms of gene called ALLELE, from each parent. Allele is the variant form of a gene.

According to Mendel's law of dominance, for a particular trait, an allele is capable of masking the expression of another allele in a gene. The expressed allele is called the DOMINANT allele while the masked allele is called the RECESSIVE allele. Due to this, an organism can express a dominant trait even in a combined or heterozygous state i.e. different alleles.

When the two heterozygous organisms mate or are crossed, they undergo meiosis and their alleles are separated into GAMETES according to Mendel's law of segregation. For example; an organism with genotype (genetic make-up) Aa will produce gametes with A and a alleles.

Note that, a recessive trait can only be expressed in a homozygous state i.e. same allele. Hence, the two heterozygous organisms will produce gametes containing the recessive allele, which will likely combine to produce a recessive phenotype or trait.

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3 years ago
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Answer:

The overall chemical reaction of cellular respiration converts one six-carbon molecule of glucose and six molecules of oxygen into six molecules of carbon dioxide and six molecules of water. ... So the carbons in the glucose become oxidized, and the oxygens become reduced.

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2 years ago
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Can blood group A donates blood to blood group O?why?
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nope that not possible because O has no antigens which can donate any blood group but A donates to same blood group bcoz of same antigen.

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Which of these correctly distinguishes mitosis from meiosis?
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Meiosis is the cell division needed to reproduce sexually, it produces the egg and sperm cells, which need to have half the amount of chromosomes, so that when they combine, they have the usual 46 chromosomes. All the other division, which produces identical cells of 46 chromosomes is called mitosis.

So the correct answer is:

<span>D)The number of chromosomes remains the same in mitosis and is reduced by half in meiosis.</span>
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Which of the following is characteristic of the second stage within a demographic transition? A. The birth rate falls to meet th
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The answer is C) The death rate begins to fall, but the birth rates remain high for a time. No countries in the world are currently in Stage 1 or demographic transition. However, many are in stage 2, which is why many governments are concerned about overpopulation. 
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