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blsea [12.9K]
3 years ago
13

A couple planning their family are aware that through the past three generations on the husband's side a substantial number of s

tillbirths have occurred and several malformed babies were born who died early in childhood. The wife has studied genetics and urges her husband to visit a genetic counseling clinic, where a complete karyotype-banding analysis is performed. Although the tests show that he has a normal complement of 46 chromosomes, banding analysis reveals that one member of the chromosome 1 pair (in group A) contains an inversion covering 70 percent of its length. The homolog of chromosome 1 and all other chromosomes show the normal banding sequence. (a) how would you explain the high incidence of past stillbirths?(b) What can you predict about the probability of abnormality/ normality of their future children? (c) Would you advise the woman that she will have to bring each pregnancy to term to determine whether the fetus is normal? If not, what else can you suggest?
Biology
1 answer:
shutvik [7]3 years ago
4 0

Answer:

Genetic counselling

Explanation:

About 15-25% of babies that are still-born are due to a defect on their chromosomes and a total 20% of still-born babies are due to a defect on chromosome one.  Since chromosome one is the largest 70% of damage will cause significant mutation and definitely, still birth.

a) The High incidence of still birth could be due to both parents carrying a defective copy of Chromosome one. There is a 25% chance of inheriting both copies from parents. The parents are unaffected because they have a normal copy but are carriers of the abnormal copy.

b)There is a possibility that the children are all normal and 50% of them will be carriers or the abnormal chromosome. This is only likely if the woman has two normal copies and no other underlying mutations.

c)There are now advancements in fertility and her options are many. She can opt for <em>in vitro</em> assistance where the affected male gametes are filtered out. Also she can do various tests while the child is still in the womb to determine the genetic predisposition. Decisions can be made after the results are given.

It is highly suggested that this woman and her husband undergo genetic counselling if they are to fully understand their condition and produce healthy children.

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creativ13 [48]

Answer:

A mutation in the DNA sequence of the gene for brown fur  

Explanation:

The mutations are capable of changing the encoded protein product, in this case the gene that encodes for the fur color pigment. This mutation may have occurred during mitosis or meiosis divisions.

If it is a spontaneous mutation that occurred in the germinal line (meiosis) and confers an adaptive advantage, it will increase their frequency in the population.

5 0
3 years ago
Can someone explain what alleles are?
Ivahew [28]
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un caballo negro de antepasados desconocidos fue apareado con cierto numero de yeguas de color rojo deraza pura, estos apareamie
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Pregunta completa: un caballo negro de antepasados desconocidos fue apareado con cierto numero de yeguas de color rojo de raza pura, estos apareamientos dieron 20 descendientes de colo rojo y 25 de color negros.

A) cual de dichos caracteres fenotipicos es mas probable que este causado por un homocigoto recesivo?

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Answer:

A) El color rojo es causado por un genotipo homocigota recesivo

B) Se habrían esperado 22.5 individuos negros y 22.5 individuos rojos, que juntos sumarian un total de 45 individuos.

Explanation:

El desarrollo del problema se encuentra disponible en el archivo adjunto

Download pdf
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3 years ago
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<h3><u>Answer;</u></h3>

Having untested DNA samples

<h3><u>Explanation;</u></h3>
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  • However, <em><u>use of DNA in forensics may have negative consequences which includes, the backlogs of forensic evidence and also present of untested DNA samples which delays the whole process.</u></em>
  • <em><u>Having untested DNA samples refers to presence of evidence collected from the crime scenes that is untested and instead it is stored in the law enforcement evidence rooms and has not been submitted to crime laboratory to be analyzed. </u></em>

5 0
2 years ago
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