Here we can see that 7 phenotypes appeared in F2 generation, so the number of genes involved is 3 and alleles is 6. Contribution per allele = 4 cm Base contribution = 6 cm
Genotype of Harvey = aa bb cc Genotype of Erma = AA BB CC
Number of dominant alleles if length is
18 cm = 18-6 / 4 = 12 / 4 = 3.
F1 generation genotype = Aa Bb Cc This clarifies why the length is 18 cm, as there are three dominant alleles.
seven 1. It is likely that there are gene pairs in this cross. There are
categories of phenotypes. The genotypes of the parents would be combinations of alleles that would produce a 6 cm ( aabbcc ) tail and a 30 cm) tail, whereas the 18 cm offspring would have a genotype of AaBbcc.
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Answer:
Option (B) Ethylene gas is a chemical signal through which ripening fruits trigger the ripening process in other fruits.
Explanation:
The ethylene hormone triggers the ripening process of fruit. However, in order to slow down the ripening process the action of ethylene is to be blocked. All fruits are capable to produce ethylene up to a certain level after which they start ripening. There are some classes of fruits that respond to the external ethylene such as apple, mango, tomato etc.
Hence, option B is correct
c The fall line is where rivers are no longer navigable by ships traveling in from the ocean, so goods had to be offloaded.
Explanation:
Cities tended to develop at the fall line of rivers simply because rivers are no longer navigable by ships travelling from the ocean and goods have to be offloaded.
- The fall line provides a natural demarcation where a coastal plain meets the upland area.
- From this area, a river enters into the ocean.
- Ships are built to navigate the ocean. Their design makes it impossible for them to coast through rivers which are smaller water bodies.
- This prompts ships coming to offload around the region where the coastal plain meets the upland area the river is coming from.
- Harbors and docks are usually built in such areas.
- They are hubs of trade and commerce attracting a large population of people.
- Therefore, cities invariably emerge.
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Nucleotides variability and average heterozygosity
