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scarlethyena149Lv1

28 Sep 2019

Trisomy 21 can be caused by nondisjunction of chromosome 21, or by inheriting a Robertsonian fusion of chromosome 21 attached to chromosome 14. Suppose an individual is a carrier for this Robertsonian fusion. How many different gametes can this individual produce?

A) 1

B) 2

C) 4

D) 6

E) 8

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Deanna HettingerLv2

28 Sep 2019

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Genetics

I dont really understand this

Please explain your answer!

Suppose you have two species of corn. One has sweet kernels and the other has large ears. Both have 20 chromosomes, each of which is homologous in both species. Suppose you want to create a hybrid that has both characteristics of sweet kernels and large ears, so you cross individuals from the two species. The initial hybrid you obtain has 20 chromosomes, but then you establish a viable tetraploid (4n) individual with 40 chromosomes. Which of the following could best explain this observation?

A		Nondisjunction of a single chromosome caused the doubling of the genome.
B		The initial F1 hybrid was unable to produce normal haploid gametes and instead produced diploid gametes. As a result, self-fertilization created progeny with 40 chromosomes.
C		The original F1 hybrid was able to produce normal gametes, thus, the tetraploid was formed by fusing one normal haploid gametes with an abnormal diploid gamete.
D		Nondisjunction of a random set of chromosomes produced abnormal gametes, and thus the 40 chromosomes represent a random assortment of chromosomes from the two parents.
E		None of the above can explain the phenomenon.

maroonzebra679

1. Chromosome morphology types include

: A. telocentric, in which the telomere is near one end of thechromosome. B. metacentric, in which the centromere is near one endof the chromosome. C. paracentric, in which the telomere issomewhat off center. D. telocentric, in which the centromere isnear one end of the chromosome. E. None of the above.

2. A karyotype is

: A. the set of chromosomes of an individual. B. 23 pairs. C. 46chromosomes. D. All of the above. E. None of the above.

3. Mutations that affect chromosome structure include all of thefollowing EXCEPT

: A. duplication. B. deletion. C. inversion. D. translation. E.Actually, all of these are mutations that affect chromosomestructure.

4.Duplications can have all of the following effects EXCEPT

: A. providing material for genetic variation and innovation. B.looping out of chromosomes during meiosis. C. novel phenotypes dueto dosage variation. D. suppression of crossing over. E. Actually,all of these can be effects of duplications.

5. Inversions:

A. include paracentric inversions, which include the centromere.B. include pericentric inversions, which do not include thecentromere. C. suppress crossing over in the inverted areas. D.usually lead to dicentric bridges. E. All of the above.

6. Translocations:

A. include reciprocal translocations, in which exchange ofchromosomal parts occurs. B. include nonreciprocal translocations,in which one chromosome donates material to another. C. suppresscrossing over in the case of reciprocal exchanges. D. can involveloss of material, as in Robertsonian translocations. E. All of theabove.

7. Unequal crossing over often leads to

: A. duplications. B. deletions. C. translocations. D. A and B.E. All of the above.

8. Aneuploidy includes all of the following EXCEPT:

A. nullisomy. B. monosomy. C. trisomy. D. tetrasomy. E.Actually, all of these are forms of anueploidy.

9. While anueploidy is a change in the number of chromosomes,polyploidy is:

A. a change in the number of sets of chromosomes. B. a change inthe structure of the chromosomes. C. an increase in the rate ofrecombination. D. an increase in the rate of mutation. E. None ofthe above.

10. Polyploidy includes:

A. autopolyploidy, which doubles the chromosome set as a resultof mitotic failure. B. autopolyploidy, which doubles the chromosomeset as a result of meiotic failure. C. allopolyploidy, whichdoubles the chromosome set as a result of meiotic failure. D. A andB. E. All of the above.

silverwolf483

6.A) If one follows 120 primary oocytes in an animal through their various stages of oogenesis, how many secondary oocytes would be formed?

B) How many first polar bodies would be formed?

C) How many ootids would be formed?

D) If one follows 120 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would be formed?

E) How many spermatids would be formed?

14. From which phase of the cell cycle does a cell enter G0 phase

21. Which of the following is true about the second meiotic division?

-The products are four identical gametes.

-Homologous chromosomes are pulling apart.

-Nondisjunction would lead to extra bivalents forming.

-Synapsis occurring in the second meiotic division.

-Sister chromatids are pulling apart.

23.Which if the following is true?

-Cells are 4n after S phase.

-Sister chromatids in mitosis are not identical.

-Cells are considered to be 2n after meiosis I.