The Earth is made up of six kinds of biomes; the majordifference between<span> each type of ecosystem is the climate. Tropical </span>rainforests<span> cover the area </span>between<span> the Tropic of Capricorn and the Tropic of Cancer and tend to be warm and wet. </span>Deserts<span>, on the other hand, are hot and dry and have very little annual rainfall.</span>
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A decomposition reaction<span> is a type of chemical </span>reaction<span> in which a single compound breaks down into two or more elements or new compounds. These </span>reactions<span> often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.</span>
Answer:
True breeding
Explanation:
One of the main reasons behind the success of Mendel's experiments was that he started the experiments with pea varieties that were true breeding. It is important to understand what a true breeding variety is, it is a plant or organism that is homozygous for a certain trait, in Mendel's case, the pea varieties were homozygous for seven traits, which are : seed coat tint, pod shape, seed shape, flower color, flower location, unripe pod color, and plant height. It means that the varieties contained two similar alleles of genes for these traits in pea plant varieties he chose. Due to the true breeding nature of these traits, the parent plants produced offspring that showed the phenotype just like their parents.
For example:
Here is a cross between plant with yellow flower with another plant containing yellow flower.Suppose allele for yellow is Y and allele for green is y. Let us see what happens in this breeding:
Parents: YY X YY
Offspring: YY
Again cross between offspring: YY X YY
Offspring: YY
This is true breeding in which offspring contain phenotype of parent in many successive generations.
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Answer options:
- The total percentage of gametes with recombinant genotypes will be 15%.
- Each recombinant gamete genotype will be produced 7.5% of the time.
- The total percentage of gametes with parental genotypes will be 100%.
- Each recombinant gamete genotype will be produced 25% of the time.
- Each parental gamete genotype will be produced 50% of the time.
- The total percentage of gametes with recombinant genotypes will be 50%.
- The total percentage of gametes with parental genotypes will be 85%.
- Each parental gamete genotype will be produced 42.5% of the time.
Answer
Explanation:
Map units are an arbitrary measurement based on the number of recombinants in a cross. Alleles on the same chromosome can only be inherited separately if crossing over occurs between them (i.e. genetic material is exchanged between different chromosomes).
The closer genes are together on a chromosome the less likely this is to occur and therefore the fewer number of recombinant phenotypes will be present.
Recombinant phenotypes are those that do not match the parents, i.e. a plant with non-yellow flowers and red tomatoes or yellow flowers and non-red tomatoes. If they are 15 map units apart, that means recombinant phenotypes when crossing 2 heterozygous individuals (F2 generation) only occur 15% of the time.
This cross is between 2 true breeding plants: YYRR x yyrr
The first parent can only produce YR gametes, and the second parent can only produce yr gametes.
Therefore, all the F1 offspring will be YyRr
The potential gametes for the F2 generation are YR, yr, Yr, yR. However, we know that Y and R are fairly close on the same chromosome. 15 map units apart means they only recombine to give yR or Yr phenotypes 15% of the time.
- The total percentage of gametes with recombinant genotypes will be 15%. - true
- Each recombinant gamete genotype will be produced 7.5% of the time. - true - <em>the combination is 15% made up of approximately 7.5% each</em>
- The total percentage of gametes with parental genotypes will be 100%. false it will be 100%-15% = 85%
- Each recombinant gamete genotype will be produced 25% of the time. false
- Each parental gamete genotype will be produced 50% of the time.
- The total percentage of gametes with recombinant genotypes will be 50%. false
- The total percentage of gametes with parental genotypes will be 85%. true
- Each parental gamete genotype will be produced 42.5% of the time. true, the combination is 42.5+42.5 = 85%