Question

In: Biology

1 how many gametes are made after one round of meiosis? 2 Which two processes lead...

1 how many gametes are made after one round of meiosis?

2 Which two processes lead to variations in the genetic makeup of the gametes?

3 How many chromosomes do body cells in humans have? What about gametes?

Solutions

Expert Solution

1. Meiosis is used for just one purpose in the human body: the production of gametes—sex cells called sperm and egg. The gametes are haploid containing n number of chromosomes. The goal of meiosis is to make daughter cells with haploid number of chromosomes as the starting cells. When a sperm and an egg join in fertilization, the two haploid sets of chromosomes form a complete diploid zygote which undergo meiosis I and II to produce 4 daughter cells.

2. cross over and mutation

During prophase of meiosis I, homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to form intermix offsprings, resulting in chromosomes with a different genetic traits.

Mutation (accidental or sudden change in genetic make-up) can result in new alleles in a population.

3. In humans, the somatic cells (all other body cells except gametes), contain 46 chromosomes which is the diploid number (2n) and each sperm and egg has 23 chromosomes where one of them is the sex chromosome (X in male and Y in female).

gladiator answered 1 year ago
Next > < Previous

Related Solutions

1. Name five differences between mitosis and meiosis. 2. During meiosis, which two processes occur that...
1. Name five differences between mitosis and meiosis. 2. During meiosis, which two processes occur that can increase genetic variation in the gametes? A.      independent assortment and crossing over B.    crossing over and cytokinesis C.    separation of the sister chromatids in Anaphase I and cytokinesis D.    independent assortment and cytokinesis E.    cytokinesis and sexual reproduction
(a) Given that any given meiosis will produce two types of gametes one with two sex...
(a) Given that any given meiosis will produce two types of gametes one with two sex chromosomes and one with only one, what combinations of sex chromosomes would you find in the sperm of a Klinefelter's man and in what proportion? (b) If a Klinefelter’s man mates with a typical (XX) female, what would you expect for the genetic composition of their children? What genotypes would you expect for all their possible children? Indicate the relative proportions of the genotypes...
What would happen if mitosis occurred in gametes of one parent instead of meiosis? How would...
What would happen if mitosis occurred in gametes of one parent instead of meiosis? How would this affect the offspring of these parents?
A diploid organism produces four gametes from one parent cell through the process of meiosis. Two...
A diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 4 chromosomes, one gamete is found to have 3 chromosomes and one gamete is found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B)...
A diploid organism produces four gametes from one parent cell through the process of meiosis. Two...
A diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 4 chromosomes, one gamete is found to have 3 chromosomes and one gamete is found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B)  ...
1) If nondisjunction occurs during meiosis II, what type of gametes would be expected? 2) Sex...
1) If nondisjunction occurs during meiosis II, what type of gametes would be expected? 2) Sex determination in Ewoks is similar to humans - female Ewoks have two X chromosomes and males have one X and one Y chromosome. A gene on the X chromosome determines eye color, where the dominant allele XB gives produces black eyes and the recessive allele Xb produces hazel eyes. Two black eyed parents have a hazel eyed son. If they have two additional children,...
Which processes associated with meiosis ensure genetic diversity in offspring? Name two processes that promote variation...
Which processes associated with meiosis ensure genetic diversity in offspring? Name two processes that promote variation and explain how they operate.
1.How many different types of gametes with respect to the R and B genes can an...
1.How many different types of gametes with respect to the R and B genes can an individual with the genotype Rr bb produce, assuming R and B are separate unlinked genes? a. 1. b. 2. c. 3. d. 4. e. None of the above. 2.In humans, which of the following statements of sex determination is true? a. In humans, XX is female, XY is male. b. In humans, XX is male and XY is female. c. In humans, X0 is...
Which three processes lead to variation among offspring that have the same two parents?
Which three processes lead to variation among offspring that have the same two parents? a) genetic recombination, fertilization, meiosis b) crossing over, random chromosome assortment, genetic recombination c) meiosis, crossing over, genetic recombination  d) fertilization, crossing over, random chromosome assortment
1. How many genetically unique gametes could be produced solely on the basis of independent assortment...
1. How many genetically unique gametes could be produced solely on the basis of independent assortment of homologous chromosomes during meiosis if the organism is: a. A diploid with a haploid chromosome number of 8   b. A diploid with 8 chromosomes c. A tetraploid with haploid chromosome number of 4 d. A tetraploid with 20 chromosomes 2. How many genetically different zygotes could be produced if: a. Two organisms mate each of which can produce 100 genetically unique gametes b....
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT