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Displaying 131-140 of 241 results.

In mice, the waltzing allele (w) that causes the mouse to run in circles due to an inner ear defect is recessive to the non-waltzing allele (W). In an ideal mouse population exhibiting Hardy–Weinberg equilibrium of 150 mice, 15% of the alleles are non-waltzing. What is the frequency of the recessive allele? Record your answer as a whole number percentage.

Posted 5 years ago by cannie247 in Biology 30 | 3 answers
#genetics and probability 

What is the correct sequence of colonizing plants on an area released from a retreating glacier?

Posted 5 years ago by llaallaallaa in Biology 30 | 1 answers
#population 

If two individuals are carriers of the cystic fibrosis allele, what is the probability that they would have a girl without cystic fibrosis? Show all your work (including the Punnett square) and express your answer as a value between 0 and 1 rounded to two decimal places. . (3 marks)

Posted 5 years ago by llaallaallaa in Biology 30 | 1 answers
#population #genetics 

 
 

The agouti gene determines coat colour in mice. Heterozygous mice have yellow coats, while homozygous dominant mice have black coats. However, having two copies of the recessive alleles is lethal. In a population of 2 000 mice, 1 082 mice have black coats. Calculate the frequency of each allele. Show all your work and express your answer as a value between 0 and 1 rounded to two decimal places. (3 marks) What percentage of the mouse population is expected to be carriers of the lethal allele? Show all your work and express your answer rounded to one decimal place. (2 marks)How many mice will die during fetal development? Show all your work and round your answer to the closest whole number. (2 marks)

Posted 5 years ago by llaallaallaa in Biology 30 | 1 answers
#population 

Water wisteria is an aquatic plant that is easy to care for and reproduces very quickly. A small man-made pond of 350 L contains 78 water wisteria plants. 15 new plants are introduced daily to the pond, while 50 plants are taken out once a week to be sold at local pet shops. The water wisteria plants reproduce at a rate of two plants per day. 

1.  What is the overall population change in a two-week period? 

Round to whole number

 

Answ

2.  What is the population density of water wisteria at the beginning? 
 

Posted 5 years ago by cannie247 in Biology 30 | 0 answers
#population 

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:
Sister chromatids
Non-sister chromatids
 None of the chromatids, since each chromatid in a tetrad contains the same allele
 All four chromatids, since each chromatid in a tetrad has a different allele

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#chromosomes #help #chromatids 

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

Answer
Answer
Answer
Answer
Mitotic metaphase  Meiotic metaphase I  Meiotic metaphase II  Meiotic telophase 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 

Posted 5 years ago by miyaomar in Biology 30 | 2 answers
#cells #meiosis #mitosis 

Which of the following statements best explains what would be different if the diagram showed anaphase I of meiosis instead of anaphase I of mitosis? 
Select one:
Each chromosome would have two sister chromatids.
Homologous chromosomes would be moving to the same end of the cell.
The sister chromatids would be pulled apart.
 Homologous chromosomes would form a tetrad.
 
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:
Four sperm with 24 chromosomes
 Two sperm with 24 chromosomes and two sperm with 22 chromosomes
Four sperm with 22 chromosomes
Two sperm with  chromosomes, one sperm with  chromosomes, and one sperm with chromosomes

Posted 5 years ago by miyaomar in Biology 30 | 0 answers
#chromosomes #chromatids #sperm 

In genetic males, there is one pair that is not homologous. Identify the pair and explain why.

Describe the processes of sexual reproduction and asexual reproduction through parthenogenesis.

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#males #genetics #diploid 

In mice, black fur (B) is dominant over white fur (b). Which of the following is not the correct method to determine if a mouse with a dominant phenotype has a homozygous or heterozygous genotype? 
Select one:
A mouse with a dominant phenotype should be crossed with a mouse with a recessive phenotype.
Test crosses need to be conducted on a mouse with a dominant phenotype to determine their genotype.
The black mouse should mate with white mice.
 A mouse with a dominant phenotype should be crossed with any true breeding mouse.

Posted 5 years ago by miyaomar in Biology 30 | 1 answers
#genetics #geno #dominate 

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