Separation of sister chromatids occurs during. a) prophase b) metaphase c) anaph

Question

Separation of sister chromatids occurs during. a) prophase b) metaphase c) anaphase d) telophase e) cytokinesis A tetrad at metaphase I is composed of ____ chromatids. a) 0 b) 1 c) 2 d) 4 e) 8 Crossing over refers to ____. a) genetic exchange between nonsister chromatids b) the formation of lateral elements between paired homologs c) genetic exchange between sister chromatids d) the random segregation of dyads e) tetrad formation Crossing over occurs during ____ a) prophase I b) metaphase I c) anaphase I d) prophase II e) metaphase II Homology search occurs during: a) leptotene b) zygotene c) pachytene d) diptotene e) diakinesis The accompanying drawing depicts a cell from an organism with 2n=2, where each chromosome has two equally long arms. The cell in this drawing mast be in ____. a) metaphase I b) anaphase I c) metaphase II d) anaphase II e) S phase If an organism has 2n = 24 chromosomes, how many chromosomes are expected in each gamete of that organism? A) 48 B) 24 C) 12 D) 6 E) 3 In human males, 1 primary spermatocyte gives rise to ____ A) 4 spermatogonia B) 2 spermatids C) 2 spermatids D) 2 spermatozoa E) 2 secondary spermatocytes In an Ascaris female, how many first polar bodies and how many ova would be expected to form from 5 oogonia? A) 20;10 B) 10;10 C) 10;5 D) 5; 10 E) 5;5 Two Drosophila gene loci vg and e are localized on nonhomologous autosomal chromosomes. They are expected to follow the Law of Independent Assortment. a) True b) False If two genes assort independently, then the double heterozygotes CcDd produce gametes in a ratio of a) all CcDd b) 1/2 CD: 1/2 cd c) 1/2 Cc: 1/2 Dd d) 1/4 Dd: 1/4 cD: 1/4 cd e) 1/4 C: 1/4 D: 1/4 c: 1/4 d

Explanation / Answer

Ans-(10)

option (C) Anaphase - In anaphase removal of cohesin laeds to the spliting of the centromerewhich results into moving of sister chromatids towards opposite spindle poles.

Ans-(11)

option d) 4 chromatids- tetrad line up at the equatorial plate in metaphase I.

Ans-(12)

option a)- Crossing over occurs between non-sister chromatids or between homologuus chromosome.

Ans-(13)

Option a)- Crossing over occurs during pachytene stage of Prophase I (Meotic division I).

Ans-(14)

Option b)- Zygotene -in this stage lengthwise pairing of homologous chromosome results into synapse (synaptonaemal complex)

Ans-(15)

Option D) - Anaphase II

2n,2c Undergo mitosis--2n,4c---undergoes meosis I-----meosis II where sister chromatids take place (n,c)

Ans-16

option C-- Total number of chromosome =24

Each gametes contain =24/2= 12 chromosome

Ans-17

Option E- In human male primary spermatocytes undergo meosisI which will give rise to two secondary spermatocytes.

Ans-18

Option C--10;5

Ans-19

True-Genes that are located on separate non-homologous chromosomes will always sort independently

Ans-20

Option D--- independent assortment shows gametic ratio 1:1:1:1

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