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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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Which technology can prevent the salmon population from decreasing? A. drift nets B. noodling C. trapping D. fish ladders
andrew-mc [135]

Answer:

Trapping

Explanation:

3 0
3 years ago
Which of the following is a species? <br> A. Giant Pandas<br> B. Horses<br> C. Humans<br> D. Rabbits
sasho [114]
I would guess giant pandas because they aren't referring to a regular panda. giant pandas are a type of panda that live in Asia. then there are other types too. my second guess would be humans just because there are no other "species" or type of human but the pure form of human.
3 0
3 years ago
Read 2 more answers
The evolution of the modern horse with a single hoof on each limb from a dog-sized ancestral species with multiple digits is an
erastovalidia [21]

Answer:

Answer is option A.

The evolution of the modern horse with a single hoof on each limb from a dog-sized ancestral species with multiple digits is an example of macro evolution.

Explanation:

In macroevolution, major evolutionary changes occur over a long time period and as a result, a species changes into another species or splits into two new species. Whales descending from a land mammal, fish descending from invertebrates, etc are examples of macroevolution.

Microevolution occurs within a population, where the evolutionary changes take place over a short period of time. This is due to the change in gene frequency by natural or artificial selection. These changes can be observed between one generation and the next generation. Antibiotic resistance shown by certain bacteria, pesticide resistance shown by certain pests in the crops, herbicide resistance shown by ants and mosquitoes, the size of the sparrow in North America (sparrows in warmer places are normally smaller than that in colder places), etc are examples of microevolution by natural selection. The production of a new breed of dog is an example of microevolution by artificial selection. Both macroevolution and microevolution are based on mutation, gene migration or gene flow, selection and genetic drift.

The types of natural selection: Directional selection, stabilizing selection and disruptive selection. The organisms that are better adapted to their environments are favored by natural selection. Stabilizing selection is the most common form of natural selection that favors intermediate phenotypes (non-extreme trait). For example, very short plants in a plant population may not get enough sunlight and very tall ones may get damaged by winds, so medium-height plants are favored. As a result, the number of very tall and very short plants decreases and the number of medium-height plants increases as they survive better.

Another example is the birth weight of humans. The babies having very high birth weight can cause life-threatening complications during delivery and the survival chance of babies having a very low birth weight is very less. Thus, the birth weight of babies is normally maintained within a medium-range by nature.

In a population, the disruptive selection favors both the extreme phenotypes and they survive better than the intermediate phenotypes. For example, the finches with large and small beaks on the Galapagos Islands (the majority of seeds on the islands were either large or small) survived better than the finches with medium-sized beaks.

The directional selection favors only one extreme phenotype over the other extreme and intermediate phenotypes. The neck length of giraffes is an example, where the giraffes with longer necks are favored (they could reach for more food in taller trees) and survive better than those with short and medium necks.

8 0
3 years ago
Mutations:
Nina [5.8K]

Answer:

B. Are Harmful

Explanation:

Harmful mutations may cause genetic disorder or cancer.

8 0
2 years ago
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