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Aleks04 [339]
3 years ago
13

With increasing age comes a greater chance of a woman having been exposed to damaging environmental agents such as drugs, chemic

als, and radiation. These factors may act on the aging oocyte to cause which abnormality in a fetus?
Biology
2 answers:
allsm [11]3 years ago
5 0
<h2>Down Syndrome</h2>

Explanation:

Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21

  • Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21
  • Down syndrome is usually caused by an error in cell division called nondisjunction which results in an embryo with three copies of chromosome 21 instead of the usual two
  • Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separates
  • With development in embryo the extra chromosome is replicated in every cell of the body;this type of Down syndrome which accounts for 95% of cases is called trisomy 21
  • Maternal age is the only factor that has been linked to an increased chance of having a baby with Down syndrome resulting from nondisjunction;here environmental agents such as drugs, chemicals, and radiation act as mutagens which induce mutation in the fetus
trasher [3.6K]3 years ago
5 0

Answer:

<h2>Down syndrome </h2>

Explanation:

Down syndrome; is a condition in which there is an extra copy of a chromosome, total chromosomes are 47 (46+1). The patient of Down syndrome contain an extra copy of 21 th chromosome. Chromosome determine how a baby's body forms during pregnancy and how the baby's body functions as it grows in the womb and after birth. Typically, a baby is born with 46 chromosomes, but in case of down syndrome, there is an extra copy of 21 number chromosome, which cause greater risk of abnormality in fetus of aging oocyte.

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8 0
3 years ago
The human MN blood type is determined by two codominant alleles, L(M) and L(N). The frequency of L(M) in Eskimos on a small Arct
tatiyna

Answer:

(a) Frequency of M = 0.64

    Frequency of N = 0.04

    Frequency of MN= 0.32

(b)  Expected frequencies of M = 0.648

     Expected frequencies of MN = 0.304

     Expected frequencies of N =  0.048

Explanation:

(a) If random mating takes place in the population, then  the expected frequencies are

f(L(M)) = p = 0.8

F(L(N)) = q

q= 1 - p

= 1 - 0.8

= 0.2

Frequency of M = p^2 = ( 0.8)^2 = 0.64

Frequency of N = q^2 = (1-p)^2 = (1 - 0.8)^2 = (0.2)^2 = 0.04

Frequency of MN = 2pq = 2 * 0.8 * 0.2 = 0.32

(b)

F = inbreeding coefficient = 0.05

f(L(M)L(M)) = p^2 + Fpq = (0.8)^2 + 0.05 * 0.8 * 0.2 = 0.648

f(L(M)L(N)) = 2 pq - 2Fpq = 2 * 0.8 * 0.2 - ( 2 * 0.05 * 0.8 * 0.2) = 0.304

f(L(N)L(N)) = q^2 + Fpq = (0.2)^2 + ( 0.05 * 0.8 * 0.2) = 0.048

5 0
3 years ago
yummious letus, a common plant species cannot fight most fungal infections, while plant species Bigous moldkillae makes a protei
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Answer:

The correct option is D)  They can insert the gene for the protein from plant species Bigous moldkillae into a chromosome in Yummious letus.

Explanation:

Biotechnology can be described as the technology in which the genome of organisms are altered so that organisms with better qualities can be produced. In the scenario discussed in the question, techniques of biotechnology can be used to insert the fungus-killing gene of Bigous moldkillae into the genome of the Yunnious letus. In this way, the Yunnious letus species will become resistant to the fungal infections.

6 0
3 years ago
Which of the following genetic disorders is described by the following:
Likurg_2 [28]

Answer:

Achondroplasia

Explanation:

Achondroplasia is a genetic disorder that comes from the inability to change cartilage into bone, especially in long bone. The characteristic of the disease is short stature, large head, vertebral abnormalities, and many other possible symptoms. It's inherited genetically by a dominant pattern, but most cases come from a mutation from a parent that has no defect gene. It is the most common cause of dwarfism.

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