) You are given a plant and are told that it is a fertile allopolyploid. Cytological examination of somatic tissue reveals the chromosome number to be 52. You are further told that one of the parent species, species A, has a haploid number of 13. What is the haploid number of the other parent, species B?
Since total number of chromosomes are 52
Species A has 13 chromosomes in haploid state means 2n state will have 26 chromosomes
Now remaining 26 chromosomes (52-26) must be from parent B. Since 2n state of parent B is 26, so haploid state of parent B would have 13 chromosomes
) You are given a plant and are told that it is a fertile allopolyploid. Cytological...
41. (6 pts) You are breeding two polyploid species of wheat. You
cross the two different
species (parent 1 x parent 2) and obtain F1 hybrids. The following
meiotic pairing was
observed in the F1 hybrid:
F1 hybrid = 12 bivalents + 12 univalents
(A) How many chromosomes are there in a non-dividing somatic cell
of an F1 plant (i.e. what
is the organisms ploidy)?
(B) How many chromosomes are there in a non-dividing somatic
cell of each parent (i.e....
Colchicine (a chemical) inhibits separation of sister chromatids in mitosis. Cultured plant cells can be treated with colchicine during one cell cycle, then exposed to the right hormones and induced to develop into small tetraploid plants. The fruit of plants is larger and seeds smaller and softer as chromosome numbers increase, so this method is used to produce more desirable fruit in some cultivated crops. A certain crop plant is made tetraploid this way. If the original haploid number was...
Question 2 (11 points) In the plant genus Triticum there are many different polyploid species, as well as diploid species. Crosses were made between three different species, and hybrids were obtained. The meiotic pairing was observed in each hybrid, and this is recorded in the following table. (Hint#1: A bivalent is two homologous chromosomes paired at meiosis, and a univalent is an unpaired homolog at meiosis. HINT #2 : For this question, review your knowledge of chromosome inheritance and pairing...
1) a plant that is heterozygous for a trait that displays incomplete dominance. if it is used in a test cross, what proportion of the progeny will be homozygous recessive? 2)Two species of the same genus have a different number of chromosome. Species A has 8 chromosomes while species B has 22.. In which species will one see more genetic variation among the progeny? Human cells have 46 chromosomes, how many different chromosome combination in the gamete are possible?
A plant species X with n=5 chromosomes was crossed with a related species Y with n = 7 chromosomes. The F1 hybrids produced only a few pollen grains, which were used to fertilize the ovules of related species Z with n=7 chromosomes. A few plants were produced from this cross, and all had 19 chromosomes. The F1 hybrids (with 19 chromosomes) were mated with related species W with n=11 chromosomes. A few plants were produced from the cross and all...
A cross has been set up between a true breeding tall plant producing white flowers and a true breeding short plant producing red flowers. One can be certain that this type of a cross: will result in a 3 red: 1 white ratio will result in all red F_1 flowers cannot produce progeny because the parental phenotypes are different from one another is a monohybrid cross is a dihybrid cross In humans, free earlobes (E) are dominant to attached earlobes...
Drosophila Genetics predictions exercise-L113 (25 pts.) Part I. Meiosis and Punnett Squares Remember, whenever you use Punnett Squares to solve genetics problems, be sure you are completing each of the following steps: 1) Identify the genotypes of the parents. 2) For the specific traits of interest, figure out what kinds of haploid gametes each parent can make. In each gamete, there should be one allele for each trait of interest. If there is more than one trait, make sure all...
Question 26 (1 point) How is cytokinesis in plant cells different from cytokinesis in animal cells? Cytokinesis in plant cells requires formation of a cell plate; cytokinesis in animal cells requires formation of a ring of actin. Cytokinesis in plant cells occurs during G2; cytokinesis in animal cells occurs in the M phase of the cell cycle. Cytokinesis in plant cell results in one large cell with two nuclei; cytokinesis in animal cells results in two cells, each with one...
If you are working with a Kangaroo species in which each somatic cell contains 16 chromosomes. How many sister chromatids are present in the early telophase of mitosis? Select one: a. O b. 16 C. 64 d.32 e. 8 Cancer cells are.............? Select one: a. Rapidly dividing body cells by mitosis b. Forming both haploid and diploid cells c Arrested in G1 phase of the cell cycle d. Arrested in Sphase of the cell cycle e. Rapidly dividing body cells...
An archer is given five arrows and is told to shoot at a target until he has hit the target or has used up the five arrows. The probability of a hit on each shot is 0.8, independently of the other shots. Let the number of arrows used by the archer be represented by the random variable X. a) (6 points) Find the probability mass function of X. b) (6 points) What is the probability that the archer has to...