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3 years ago

How do prophase 1 and metaphase 1 play in important role in the genetic diversity of the daughter cells produced?

1 answer:

8 0

In prophase 1:
Chromosomes become visible, crossing-over occurs, the nucleolus disappears, the meiotic spindle forms, and the nuclear envelope disappears.
In metaphase 1:
The pairs of chromosomes (bivalents) become arranged on the metaphase plate and are attached to the now fully formed meiotic spindle. The centrioles are at opposite poles of the cell.
I hope my answer has come to your help. God bless and have a nice day ahead!

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Why is Social Distancing and Quarantine Important?

Oliga [24]

Answer:

So you dont spread the germs along with wearing masks this helps a lot.

Explanation:

8 0

2 years ago

If a blue eyed mother with a normal vision has a brown eyed color blind son and a blue eyed colored blind daughter what are the

Rina8888 [55]

Answer: mother: XX^aa, father: X^YAa, son: X^YAa, daughter: X^X^aa.

Explanation:

Color blindness is a genetic disorder that affects the ability to distinguish colors. It is hereditary and is transmitted by an X-linked recessive allele. If a male inherits an X chromosome with the altered allele he will be color blind. In contrast, females, who have two X chromosomes, will only be colorblind if both of their X chromosomes have the altered allele. This is because males have one X chromosome and one Y chromosome, while females have two X chromosomes.

If the woman has normal vision, that means she cannot have both chromosomes affected. She can only have one affected chromosome (be a carrier) or none at all. Also, if she has blue eyes, which is a recessive trait, then both alleles are recessive. But the eye color is not on the X chromosome. For example, her eye color genotype can only be aa, because if she had at least one dominant allele she would have brown eye color. As for the other trait, she can be XX^, with X^ being an affected (carrier) allele or XX, i.e. both normal. So in summary, her genotype can be XXaa or XX^aa

If she has a brown-eyed male child who is also colour blind, he has inherited the allele for colour blindness from his mother, since the father does not pass on an X chromosome to the male children, only the Y. With this we can now rule out the mother's XXaa genotype since she had to have passed on her affected X^ chromosome. Then the genotype of the mother is XX^aa. And since her mother can only pass on one allele to (recessive) because she does not have allele A, the dominant that determines her brown eye color can only come from the father. So the genotype of this son is X^YAa. The female daughter has color blindness and blue eyes. So she had to inherit the affected X^ chromosome from the mother (which we already know she has) and an affected X^ chromosome from the father, because the daughter needs to inherit both affected X^ chromosomes to develop the disease. And if she also has blue eyes, she had to have inherited a recessive allele from the mother and another from the father. So with this information we can say that the father's genotype can only be X^YAa. Because the father must have both A and A alleles of the same eye color, because he passed the dominant one to the son and the recessive one to the daughter. At last, the genotype of the daughter is X^X^aa.

8 0

3 years ago

Complete the following analogy regarding cell division.

Georgia [21]

Reproduction of a cell from an existing cell

4 0

3 years ago

"Draw a pedigree for hitchhiker’s thumb. Your pedigree should cover at least two generations and include both dominant and reces

igor_vitrenko [27]

Answer and Explanation:

First, you need to know how to interpret a pedigree representation.

Family members

→ Individuals are represented with geometrical figures.

→ Males are squares

→ Females are circles

Trait/Phenotype

→ Healthy/normal/not affected individuals are represented with empty figures

→ Affected/mutated individuals are represented with solid black figures

Generations

→ Each file is represented with a roman number, indicating the Generation.

Now, what we need to do is to draw a pedigree for a hitchhiker’s thumb. We know that this is an autosomal dominant trait, which we will represent with an H. No hitchhiker's thumb is the recessive trait, and it will be represented with an h.

Our pedigree should cover at least two generations and include both dominant and recessive forms of the trait.

We can cross two heterozygous individuals, Hh, who are the first generation in our pedigree.
This cross will result in a woman and a man with No hitchhiker's thumb, another man with a hitchhiker's thumb, HH, and another woman with a hitchhiker's thumb, Hh. These individuals will represent the second generation in the pedigree.
Finally, we can cross the man with No hitchhiker's thumb, hh, with a woman who does not have a hitchhiker's thumb either, hh. And the woman with a hitchhiker's thumb, Hh, with a man with a hitchhiker's thumb, HH. The result of these crosses will be the third generation.

The representation would be like following,

I → First-generation: First cross

Man Hh (1)
Woman Hh (2)

II → Second-Generation: F1 and second crosses

Man hh (3) x Woman hh (4)
Woman hh (5)
Man HH (6)
Woman Hh (7) x Man HH (8)

III → Third-Generation:

A boy (9) and a girl (10) hh
A girl (11) HH

You will find this pedigree in the attached files. In this example, we included three generations. The first one belongs to the grandparents, the second one to parents, aunts/uncles, and the third one to grandchildren.

If you draw another pedigree, remember to include

the figures representing males and females,
color and H/h representing the phenotype,
Roman numbers representing the generations, and optional, numbers naming each member.

5 0

3 years ago

What term is defined as bodies of water stored in underground spaces?

mash [69]

I think the answer this question is looking for is 'aquifer', but the definition given is not completely correct. Rather than a body of water stored underground, groundwater is often stored in a layer of permeable rock, rock fractures or unconsolidated materials, such as gravel, sand, or silt. So the reference to a 'body' of water is misleading, as it give the impression that groundwater occurs as underground lakes or rivers. Although this can sometimes be the case, groundwater often exists in between small spaces in the underlying geology.

8 0

3 years ago