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Lana71 [14]
3 years ago
13

In corn, small pollen (sp) is recessive to normal pollen (sp+) and banded necrotic tissue, called zebra necrotic (zn), is recess

ive to normal tissue (zn+), The genes that produce these phenotypes are closely linked on chromosome 10, If no crossing over occurs between these two loci give the types of progeny expected from the following cross: a) sp+ zn+/sp+zn+; sp+ zn+/sp zn: sp zn/sp zn b) sp+zn/sp zn;l sp zn +/sp zn c) sp + zn/sp zn: sp zn/sp zn d) sp+zn/sp+ zn; sp + zn/sp zn+; sp zn+/sp+ zn; sp zn+/sp zn+ e) sp+ zn+/sp zn; sp+ zn/sp zn
Biology
1 answer:
Colt1911 [192]3 years ago
8 0

Answer: sp+ zn+/ sp+ zn+ ; sp+ zn+/ sp zn; sp zn / sp zn ​

Explanation: f a double heterozygote is testcrossed and gametes are produced in a ratio of 1:1:1:1, this can be interpreted as unlinked genes or as genes that are 50 map units apart. Because gametes this far apart cannot be distinguished from gametes that are unlinked, it's not possible to get a ratio of gametes that indicates a distance of greater than 50 map units.

A man and a woman are trying to have children but are unsuccessful. As part of a series of tests, the man is karyotyped. His autosomes appear normal, but his sex chromosomes, shown in the following diagram, are not. The diagram also shows a normal male's sex chromosomes for reference.

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This sentence is true in the case of gastric cavity of cnidarians - digestive enzymes released into the gastric cavity allow the consumption of whole prey such as fish.

Extracellular digestion is carried out by cnidarians, in which the cells that line the gastrovascular canal receive the nutrients and enzymes split down the food particles. With only one opening, the gastrovascular cavity that doubles as both the mouth and the anus in cnidarians acts as their only digestive system. There is only one entrance in the central gastro-vascular cavity, which serves as both a mouth and a drain for waste. Digestion occurs both within and outside of cells.

Cnidarians consume food through their lips, and the coelenteron then breaks it down. Waste products are subsequently eliminated either via the mouth or via cell surface via water circulation, while nutrients are then sent to other parts of the body for use.

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