Tag: reproduction and modern technology

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Questions Related to reproduction and modern technology

Multiple choice biology reproduction in humans twins reproduction and modern technology post fertilization events

Fraternal twins in humans are produced when

  1. Two sperms fertilize an ovum and the first two blastomeres separate from each other

  2. One sperm fertilizes an ovum and the first two blastomeres separate from each other

  3. Egg develop parthenogenetically and first two blastomeres separate from each other

  4. Two ova are fertilized simultaneously
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fraternal twins are also called as 'dizygotic'. This means there is fertilization of two seperate eggs(ova) by two individual sperms simultaneously. They are implanted in the uterine wall at the same time. They usually develop in two separate amniotic sacs. They are also called as 'biovular' since two eggs form two zygotes.
So, the correct is answer is 'Two ova are fertilized simultaneously'.

Multiple choice biology reproduction in humans twins reproduction and modern technology post fertilization events

What are identical twins?

  1. Heterozygous

  2. Homozygous

  3. Monozygotic

  4. Dizygotic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Image result for monozygotic identical twin
Twins are two offsprings produced by the same pregnancy. Twins can either be monozygotic (identical twin), meaning that they develop from one zygote that splits and forms two embryos, or dizygotic (fraternal twin), which are produced from two eggs. Thus, the correct answer is option C.

Multiple choice biology reproduction in humans twins reproduction and modern technology post fertilization events

Which are the two offspring developed in the same uterus but from fertilization of two different ova?

  1. Dizygotic twins

  2. Monozygotic twin

  3. Fraternal twins

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dizygotic twins may occur if two or more oocytes are released in one cycle. If each is fertilized, dizygotic twins may result. Fertility drugs are a common cause for dizygotic twins, but other factors, like family history, maternal age or weight, can also lead to dizygotic twinning. Thus, the correct answer is option D.

Multiple choice biology reproduction in humans twins reproduction and modern technology post fertilization events

Monozygotic twins develops from

  1. Different zygotes

  2. Different ova

  3. Different sperms

  4. Same zygote
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • There are two types of twins, Fraternal or dizygotic twins, and monozygotic twins.
  • When the zygote, during the cleavage, separates and forms two different cells and both of them grow individually as embryos, they form the monozygotic twins.
  • Monozygotic twins are of the same sex.
  • When 2 zygotes are fertilized by two different sperms they form the dizygotic twins.
  • They can be of different sex.

So, the correct option should be 'Same Zygote'.

Multiple choice biology reproduction in humans twins reproduction and modern technology post fertilization events

Concordant type of twins are

  1. Free martins

  2. Dizygotic twins

  3. Monozygotic twins

  4. Both B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Monozygotic or identical twins are those twins which are formed by the splitting of one zygote into two embryos. They have almost the same characteristics both phenotypically and genotypically. Dizygotic or fraternal twins are formed when two different eggs are fertilized by two different sperms.
so, the correct option is ' Monozygotic twins'.
Multiple choice biology reproductive health twins reproduction and modern technology stds and infertility

Read the following statements.
(i) Birth control pills are likely to cause cardiovascular problems.
(ii) A woman who substitutes or takes the place -of the real mother to nurse the embryo is called surrogate mother.
(iii) Numerous children have been produced by in vitro fertilisation but with some abnormalities.
(iv) Woman plays a key role in the continuity of the family and human species.
(v) Foetal sex determination test should not be banned.
Which of the following pair consists of incorrect statement ?

  1. (i) and (ii)

  2. (ii) and (iv)

  3. (iii) and (v)

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Numerous children have been produced by in vitro fertilisation without any abnormality. Foetal sex determination test should be banned as it is being misused for female foeticide.

Multiple choice biology reproductive health twins reproduction and modern technology stds and infertility

Which of the following breeding techniques is used to improve herd genetics?

  1. Artificial insemination

  2. Embryo transfer

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Both the methods are used to improve the herd genetics by adding a new set of desired genes to the herd. This increases the quality of the gene pool of the herd.  

So the correct option is 'Both A & B'.

Multiple choice biology reproductive health twins reproduction and modern technology stds and infertility

Transfer of ovum from donor to recipient oviduct is

  1. GIFT

  2. ICSI

  3. ZIFT

  4. ET
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

GIFT referred as a gamete intra Fallopian transfer. In this, the egg from the donor and the sperm from the father (or the donor male) is taken and are transferred to the oviduct or the Fallopian tube of the recipient. 

So the correct option is 'GIFT'.

Multiple choice biology reproductive health twins reproduction and modern technology stds and infertility

Stage transferred to uterus after induced fertilization of ova in the laboratory is

  1. Embryo at two-blastomere stage

  2. Morula

  3. Zygote

  4. Embryo at four blastomere stage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Intra-Uterine Transfer (IUT) embryo with more than 8-blastomeres stage (morula) is used for transfer into the uterus after induced fertilisation in the laboaratory.

So, the correct answer is 'Morula'.