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166.The stem cells which have potency to give rise to all tissue and organs are formed from
(l) Trophoblast
(2) Blastoderm
(3) Inner cell mass
(4) Amniogenic cells
167. Crossing over occurs :-
(a) Between non-sister chromatids of homologous chromosomes.
(b) Between two different linkage groups.
(c) Within a linkage group.
(d) Between non-homologous chromosomes

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Solution

167. answer will be (a) Crossing over : crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis,which results in new allelic combinations in the daughter cells 166. answer will be (3) Inner cell mass converted in to germ layer in gastrulation phase .there are three germ layer ectoderm, mesoderm and endoderm .they serve as the initial rudiments of all the future tissue and organs of the offspring's body.

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Similar questions

Q. Consider the following statements (A D) and select the correct option stating ones are true (T) and false (F)?
A. Genes located on different chromosomes always show linkage.
B. Homologous non-sister chromatids participate in crossing over during gamete formation.
C. The frequency of crossing over between any two genes is generally proportional to the distance between them on the chromosome
D. Two non-sister chromatids participating in crossing over at any given point will lead to the formation of one type of gamete.

Q. Name the stage of cell cycle at which one of the following events occurs. (i) Chromosomes are moved to spindle equator. (ii) Centromere splits and chromatids separate. (iii) Pairing between homologous chromosomes takes place. (iv) Crossing over between homologous chromosomes takes place.

Name the stage of the cell cycle at which one of the following events occur:

(i) Chromosomes are moved to the spindle equator
(ii) Centromere splits and chromatids separate
(iii) Pairing between homologous chromosomes takes place
(iv) Crossing over between homologous chromosomes takes place

Question 4
During Anaphase - I of meiosis
(a) homologous chromosomes separate
(b) non-homologous autosomes separate
(c) sister chromatids separate
(d) non-sister chromatids separate

Q. Statement I: Synapsis is the process of pairing of homologous chromosomes.
Statement II: Crossing over occurs between sister chromatids of homologous chromosomes.
Which of the above statements are correct?

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