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Displaying 161-170 of 241 results.
During meiosis, homologous chromosomes synapse and form tetrads. In a homologous pair, one of the chromosomes comes from the mother (maternal homologue) and one comes from the father (paternal homologue).Since replication occurs before meiosis, each tetrad consists of four chromatids (tetra means four). The chromatids of the same homologue are called sister chromatids, and the chromatids of different homologues are called non-sister chromatids.If the maternal homologue carries allele A and the paternal homologue carries allele a for a certain gene, which of the following will have different alleles for this gene?
Select one:
a. Non-sister chromatids
b. Sister chromatids
c. None of the chromatids, since each chromatid in a tetrad contains the same allele
d. All four chromatids, since each chromatid in a tetrad has a different allele
 
Germ cells are specialized cells that develop into gametes. Gametes are produced through the process of meiosis.If the diploid number for humans is 46 chromosomes, how many chromatids does a cell undergoing meiosis have at each of the following phases?Select the row that correctly shows the number of chromatids at each phase.
Select one:
a. G2 of Interphase Metaphase I Prophase II 92 92 46
b. G2 of Interphase Metaphase I Prophase II 46 92 23
c. G2 of Interphase Metaphase I Prophase II 92 46 46
d. G2 of Interphase Metaphase I Prophase II 46 46 23

 

In an organism with a diploid number of 16, how many chromatids are present in each of the following phases:

Answer
Answer
Answer
Mitotic metaphase Meiotic metaphase I Meiotic metaphase II
The diploid chromosome number of a cat, Felis catus, is .Which of the following rows correctly identifies the number of egg cells and chromosomes in each cell after the process of oogenesis has completed?
Select one:
a. # of Cells # of Chromosomes
b. # of Cells # of Chromosomes  
c. # of Cells # of Chromosomes
d. # of Cells # of Chromosomes  

  

Use the following information to answer the next two questions.Nondisjunction is an error in meiosis that results in non-separation of chromosomes during anaphase. Nondisjunction can occur during anaphase I or anaphase II of meiosis.

Which of the following correctly describes the gametes that will form as a result of nondisjunction during anaphase II in a human male?
Select one:
a. Four sperm with  chromosomes
b. Two sperm with  chromosomes, one sperm with  chromosomes, and one sperm with  chromosomes
c. Two sperm with  chromosomes and two sperm with  chromosomes
d. Four sperm with  chromosomes
 
Which of the following statements is true?
Select one:
a. More gametes will be affected if nondisjunction occurs during anaphase I than if nondisjunction occurs during anaphase II.
b. Nondisjunction during anaphase I or anaphase II will have the same effect.
c. More gametes will be affected if nondisjunction occurs during anaphase II than if nondisjunction occurs during anaphase I.
d. Nondisjunction during anaphase I or anaphase II will have no effect on the gametes formed.
 
Which of the following cells is penetrated by a sperm cell during the process of fertilization?
Select one:
a. Secondary oocyte
b. Oogonia
c. Primary oocyte
d. Ovum
 
 

Posted 4 years ago by vowoeye in Biology 30 | 1 answers
#cell divison and genetics 

Feather colour in parakeets is controlled by two genes. Blue colour (B) is dominant over absence of colour (b). Yellow colour (Y) is dominant over absence of colour (y). When a B allele and a Y allele are present, a green parakeet is produced. What is the percent probability of obtaining a yellow or blue parakeet when a heterozygous green parakeet is crossed with a white parakeet? What are the genotypes of the parents?

Posted 4 years ago by msather in Biology 30 | 1 answers
#polygenic traits #genetics and probability 

Will a mutation on the SENSE strand changes anything? During replication, it is only the ANTI-sense strand is transcribed.

Posted 4 years ago by John111 in Biology 30 | 5 answers
#mutations #dna 

Match each structure in the reflex arc numbered above with its description given below. 

 

Posted 4 years ago by Elise477 in Biology 30 | 1 answers
#reflex arc 

what is the difference(s) between autosomes 1-22 and chromosome pair 23

Posted 4 years ago by kez90 in Biology 30 | 2 answers
#chromosomes 

how can I tell if there are more positive ions in a cell than another with different RMP

Posted 4 years ago by in Biology 30 | 0 answers
#resting membrane potenital #action potential 

A horse sperm cell has a haploid number of 32 chromosomes. the number of cells, the number of chromatids, and the number of chromosomes at the end of each of the following stages of meiosis and mitosis. 

Meiosis: Prophase I - How many of the following?

Number of cells

Number of Chromatids

Number of Chromosomes

 

Prophase II - 

Number of Cells

Number of Chromatids

Number of Chromosomes

 

Mitosis: Telophase

Number of Cells

Number of chromatids

Number of Chromosomes

 

Posted 4 years ago by thisgirl in Biology 30 | 0 answers
#cell division #mitosis #chromatids #chromosomes 

The conifer plant has 18 chromosomes. For each of the four stages on the diagram of the conifer life cycle, labelled A-D, identify whether the stage is haploid or diploid, and indicate the number of chromosomes that would be found in the cells at each stage

Stage  Haploid or Diploid?  Number of chromosomes found in cells?  A      B      C      D     

 

Posted 4 years ago by thisgirl in Biology 30 | 1 answers
#cell division #mitosis #miosis 

A pure breeding yellow bird is mated with a pure breeding blue bird. There is a lack of dominance in feather colours and all offspring are green feathered. What are the correct genotypes of a green bird, yellow bird, and blue bird, respectively?
Select one:
a. BY, YY, and BB
b. By, yy and BB
c. Yb, YY and bb
d. Bb, bb and BB

Posted 4 years ago by thisgirl in Biology 30 | 3 answers
#bio genotype 

In mice, black fur (B) is dominant over white fur (b). 

 
A testcross was performed to determine the genotype of a black mouse. What is the genotype of the mouse that was test crossed with the unknown black mouse? 
 
I put Bb, wouldn't it be bb for the other mouse?

Posted 4 years ago by thisgirl in Biology 30 | 1 answers
#test cross #punnet 

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