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Garden peas normally have 7 pairs of chromosomes (n=7, 2n=14). Please calculate
how many different types of gametes can be produced through the meiotic process if no crossover happens. If cross-over happens regularly, how many different types of gametes can be produced and why?

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Related questions

Assume gene pairs located on different pairs of homologouschromosomes unless otherwise stated.

4. Mendel observed a 9:3:3:1 ratio of offspring when studyingdifferent traits. What would he have concluded if he had observed a3:1 ratio for two traits?

5. How many different types of gametes are produced by genotypeYyRr if Y and R are on different chromosomes? What are they?

6. How many different types of gametes are produced by genotypeYyRr if Y and R are on the same chromosome (assume the dominant YRand recessive yr traits are together)? What are they?

8. Using the previous table, if A and B show incompletedominance, how many offspring would exhibit the homozygousdominant, heterozygous, and homozygous recessive phenotypes forboth traits together?

9. In a cross between AaBbCcDD and AabbCCDd, what is theprobability of an offspring with the phenotypes or genotypes below?Show math.

Phenotype Dominant A, Dominant B, Dominant C, and Dominant D

Phenotype Recessive A, Recessive B, Dominant C, Dominant D

Genotype aaBbCcDD

Genotype AAbbCCDd

Genotype AabbCCdd

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.
-A chromosome always contains the same number of chromatids, regardless of phase of the mitotic or meiotic cell cycle.
-A chromosome may contain one or two chromatids in different phases of the mitotic or meiotic cell cycle.

Consider each of the following statements.

In meiosis, the chromosomal material doubles during the lastpremeiotic interphase.

The greater the number of chromosome pairs, the greater is theeffect of meiosis in producing genetically distinct gametes.

The diploid number of chromosomes is half the haploidnumber.

A cell that will not divide again remains in the G­2 stage ofinterphase.

The correct sequence of events during meiosis is: synapsis ?dyad formation ? chiasma formation

In an organism with n = 3, there is a 1 in 8 probability of agamete with all maternally derived chromosomes contributing to theproduction of a zygote.

An organism with n = 3 can produce 8 different kinds of gametesin relation to combinations of maternal and paternalchromosomes.

Separation of sister chromatids occurs during anaphase I ofmeiosis and is the physical basis for the law of independentassortment.

A single diploid cell that undergoes meiosis in the male testiswill produce 4 genetically different gametes if crossing-over isignored.

The independent alignment of different tetrads at metaphase I ofmeiosis is the physical basis of the law of independentassortment.

If a diploid cell has 20 pairs of chromosomes, there will be 10tetrads during prophase I of meiosis.

If a diploid cell has 20 pairs of chromosomes, there will be 20bivalents during prophase I of meiosis.

If a diploid cell has 20 pairs of chromosomes, there will be 80chromatids present during metaphase of mitosis.

If a diploid cell has 20 pairs of chromosmes, the organism canmake 202 types of gametes if crossing-over isignored.

Segregation of sister chromatids occurs during anaphase I ofmeiosis and is the physical basis of the law of segregation.

For an individual with a diploid number of 30 chromosomes, therewill be 60 chromatids at metaphase I of meiosis.

For an individual with a diploid number of 30 chromosomes, therewill be 15 tetrads at metaphase II of meiosis.

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