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Step2247 [10]
3 years ago
11

explain why a father with blood group AB cannot donate for a child with blood group O when he marries a woman with blood group O

​
Biology
1 answer:
denis-greek [22]3 years ago
7 0

The odds are astronomical for a father with AB(IV) to have an O(I) child. The only possible way for this phenomenon to occur is if there was a nondisjunction in the ovogenesis for the 9th chromosome and the father also had a nondisjunction for the same chromosome(A sperm cell with no 9th chromosome fertilized an ovum with two 9 chromosomes).

A person with AB cannot donate to a person with O because the receiver has antibodies(alpha and beta) that bind to the antigens on the AB blood cells, causing death.

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The extra cellular matrix on most connective tissues is made up of predominantly fibers and what?
dalvyx [7]

Answer:

The correct answer will be- proteoglycans and the glycoproteins

Explanation:

The connective tissue forms a very large proportion of the total mass of a body. The connective tissue plays a distinct role in the body like the movement of the cell, mechanical support, wound healing but the main role is to connect different tissues of the body.

The property of the connective tissue is determined by the amount and type of the extracellular matrix present which contains three main components which are the fibres like collagen, glycoproteins and the proteoglycans.

Thus, proteoglycans and glycoproteins are the correct options.

6 0
3 years ago
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.

8 0
3 years ago
What do african birds eat and pic​
Vanyuwa [196]

Answer:

if these mixtures are feed as only source of food African grey parrots become ill and ultimately die.

not sure about the answer but see if this is correct.

4 0
3 years ago
Read 2 more answers
PLEASE HELP WILL GET FAILING GRADE IF I CAN'T FINISH THIS ASSIGNMENT!!!
miskamm [114]
1. Depth: The water level in the Great Salt Lake fluctuates from year to year.  Water levels drop and salinity increases when less water flows into the lake than usual. Not only that, but the wetlands dry up and the shoreline recedes. The reason the shoreline shifts so dramatically is because it sits at the bottom of a broad and relatively flat basin. For a visual example, think of pouring water into a plate versus a bowl.  
Salinity: This Great Salt Lake has a high mineral content, as most terminal lakes are, which means that it is quite salty.   Even the fresh water flowing into the lake contains small amounts of dissolved minerals.  As water evaporates from the lake, the minerals stay behind.  As a result, these minerals have accumulated to very high levels because they have been left behind for thousands of years. The Great Salt Lake is between 3.5 and 8 times saltier than the ocean. However, the organisms that survive in such saline conditions have adapted to their surroundings through special features. 
Temperature: The Great Salt Lake has a very shallow depth, with an average of 14 feet deep and a mere maximum of 33 feet. This means that a lot of the surface area is exposed to the air, and is at the mercy of its seasonal temperature fluctuations. In the summer, rise to more than 80 degrees Fahrenheit while falling to below freezing in the winter.  
2. Depth: Salinity drops and lake levels rise during high precipitation years. Wetlands get covered by salt water, and the shoreline expands, sometimes destroying wildlife habitats and killing sensitive vegetation. 
Salinity:  <span>Changes in lake elevation are accompanied by changes in salinity. The salinity in the lake decreases as incoming fresh water dilutes the salt water.  This happens during the wet years.  During dry years, however, salinity increases as continued evaporation removes fresh water.  
</span>Temperature: Because of the lake's salt high content, the water doesn't usually freeze. However, as the temperature drops during the winter, less saline zones freeze solid, and most of the lake turns into a vivid pea-soup green color.  In mid-March, temperatures begin to rise again as brine shrimp begin hatching.  By late April, juvenile, and adult brine shrimp fill the water, serving as food for migrating and breeding birds.
3. Brine shrimp are smaller in highly salty water and larger in less salty water. Also, salinity levels also affect the rate of sexual development. Higher salinities produce adults who reach maturity quicker but are shorter in length. As salinity increases, the abdomen becomes longer relative to body length.  Low salinity may also cause cysts to crack prematurely, as well as allowing other competitors into the ecosystem.  High salinity results in offspring that develop quickly but are smaller and have a relatively longer abdomen.  In short, effects of abiotic conditions on brine shrimp are development rate, the rate of sexual maturity, the overall length of the abdomen, amount/type of food available, cyst density and location.
4. One limiting factor of brine shrimp are predators: corixids that consume brine shrimp, grebes that consume brine shrimp and their cysts, and humans that commercially harvest brine shrimp cysts.  Another limiting factor for brine shrimp is cooler temperatures.  They<span> are much more productive in warmer water and consume more phytoplankton.  However, when the lake water temperature is cold, the shrimp population tends to decline. </span>
4 0
3 years ago
Help please!!! asap!!
Leto [7]

Answer:

Water

Explanation:

5 0
2 years ago
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