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Firdavs [7]
3 years ago
14

Which correctly describes crossing over?

Biology
1 answer:
Reika [66]3 years ago
8 0

Answer:

Crossing over is the process whereby homologous chromosomes are pulled to opposite poles of the cell.

Explanation:

I hope this helps

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Changes in wind strength during an El Niño affect surface currents, which affects weather patterns. In 3–5 sentences, explain wh
Aleonysh [2.5K]

Answer:

El Niño is defined as an unusual weather pattern seen in the Pacific Ocean. In this weather unusual winds allows the surface water to get warm from the equator to move east, that is toward Central and South America.

So, El Niño affects wind shear, in which air current present in lower altitude moves to different direction from winds higher in the atmosphere and affects weather patterns. such as El Niño is responsble for more rain in South and Central America and in the United States.

3 0
2 years ago
Identify the phenotypes for the offspring of a parent with the genotype IBi and a parent with the genotype IAIA. type O type A,
agasfer [191]
 <span>I is dominant, i is recessive. The A's and B's are just show which allele I is. When there is just one dominant allele, it masks the recessive in blood typing. Remember IA and IB are codominant. 

O is always ii 
A is IAi (heterozygous) or IAIA (homozygous) 
B is IBi (heterozygous) or IBIB (homozygous) 
AB is always IAIB 

Remember: You get one allele from each parent! 

1. Father must be ii, mother must be ii, so all children must be ii. 

2. Father is IAIA (the homozygous one), the mother is IBIB, so the only possibility for the children is IAIB, because you get one allele from the father and one from the mother. 

3. Father is IAi, mother is IBi, so the children can be any of the blood types, because they can have all the combinations of genotypes. 

4. Father is ii, mother is IAIB. Children can only be IAi or IBi. 

5. Father is IAIB, mother is IAIB. Children can be IAIA, IBIB, or IAIB. 

Example of Punnett square: 
3. Father is type A, heterozygous, mother is type B, heterozygous 
Father must be IAi (heterozygous) 
Mother must be IBi (heterozygous) 

_______IA ____ i 

IB____ IBIA____IBi 

i _____ IAi______ii 

Sorry, that was difficult on here, hope it's understandable. 
The father's alleles run across the top, the mother's are on the side, you follow to where they meet to find the possibilities for the children. IBIA (AB blood type), IBi (B), IAi (A), and ii (O) are the possibilities in this case. 

Hope that helps!</span>
6 0
3 years ago
5. Species of Homo ______________ found in Java suggest that this species of hominine spread rapidly after leaving Africa.
natulia [17]
The species was Homo erectus
3 0
3 years ago
Macy observes the lake near a park is covered in green slime. Over a few days she sees that the fish in the lake have started dy
horsena [70]

An algal bloom has drained the lake of oxygen.

Explanation:

The possible cause of the fish death in the lake near the park is that an algal bloom has drained the lake of oxygen.

The green slime on top of the lake are the growing algae.

  • This condition is caused by eutrophication.
  • It occurs when nutrients are enriched in a water body causing the growth of algae.
  • Algae bloom causes the depletion of oxygen levels in the ocean.
  • They block off plants from producing oxygen and enriching water with it.
  • Fishes need oxygen for their life actions.

learn more:

Algae brainly.com/question/1739812

#learnwithBrainly

3 0
3 years ago
In two or more sentences, explain how DNA replicates, including what percentage of the replicated strand is new vs. old.
k0ka [10]

Answer:

DNA replication is the process by which DNA makes a copy of itself during cell division

1 by unzipping the double helicase or the double helix structure of the molecule

2. the separation of two single strand of DNA

The percentage of the replicated strands of the new to the old is 50-50

6 0
3 years ago
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