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Displaying 1-10 of 430 results.
In fruit flies, long wings (L) are dominant over short wings (l). LL, Ll, and ll represent
Select one:
 Three genotypes
 Three true breeding crosses
 Three dominants
 Three phenotypes

Posted 15 hours ago by miyaomar in Biology 30 | 1 answers
#geno #phenotypes #dominate 

The roan coat colour in shorthorn cattle is the result of codominance of the coat colour alleles. A roan shorthorn mated with a white shorthorn. What is the probability that the offspring will be white shorthorn? AnswerRecord the answer as a value between 0 and 1, with two significant digits.

 

 

In cattle, a polled or hornless trait (P) is dominant over a horned trait(p). A polled bull mated with three different cows, and the following calves were born in the spring.  Cow Phenotype  F1 Generation Phenotype  Cow 1 - Horned  Calf 1 - Horned  Cow 2 - Polled  Calf 2 - Horned  Cow 3 - Polled  Calf 3 - Polled  Which of the following rows correctly identifies the genotypes of the cattle?
Select one:
Cow 2 - pp  Calf 1 - Pp 
Cow 1 - pp  Bull - PP 
Cow 3 - Pp  Calf 3 - pp 
Bull - Pp  Calf 2 - pp 

Posted 1 day ago by miyaomar in Biology 30 | 0 answers
#genetics #punnet #help 

Which of the following statements describes Mendel’s Law of Segregation?
Select one:
A Bb individual will produce B and b alleles, while a bb individual will only produce a b allele.
The dominant allele is represented with an uppercase letter and the recessive allele is represented with a lowercase letter.
A Punnett square can be used to predict the outcome of a parental cross.
Dominant alleles are always expressed in a homozygous or heterozygous individual.
 
In tomatoes, red fruit (R) is dominant over yellow fruit (r). Five generations of red tomato plants were crossed with yellow tomato plants without producing any yellow tomato plants. It can be hypothesized that the red tomato plant must be
Select one:
Homozygous
Dominant
Heterozygous
Recessive
 
 
 
Which of the following statements illustrates codominance?
Select one:
Grey heterozygous chickens have black and white feathers.
Individuals who are heterozygous for the sickle cell anemia allele are more resistant to malaria.
two parents with blood types A and B can have children with blood type O.
. Red flowers crossed with white flowers produce pink flowers.

Posted 4 days ago by miyaomar in Biology 30 | 0 answers
#geno #genetics #homozygous 

Describe the processes of sexual reproduction and asexual reproduction through parthenogenesis. 
There is a lack of dominance in four o’clock plant flowers. When a red flower is crossed with a white flower, a pink flower is produced. A white four o’clock flower was crossed with a pink four o’clock flower. What is the likelihood of getting red flowers from this cross?
Select one:
50%
0%
25%
 100%

Posted 5 days ago by miyaomar in Biology 30 | 0 answers
#punnet #help #sexual 

 
 
There is a lack of dominance in black and white horse coat colours. An offspring produced from a black horse and a white horse has a blue-roan coat colour. When the blue-roan coat is closely examined, both black and white hair can be found. A black horse mated with a blue roan horse. Which of the following alternatives correctly identifies the phenotypic ratio of the offspring?
Select one:
1 white : 1 black
1 WW : 1 BB
 1 BB : 1 BW
1 black : 1 blue roan
 
here is a lack of dominance in four o’clock plant flowers. When a red flower is crossed with a white flower, a pink flower is produced. A white four o’clock flower was crossed with a pink four o’clock flower. What is the likelihood of getting red flowers from this cross?
Select one:
 50%
 0%
25%
100%

Posted 6 days ago by miyaomar in Biology 30 | 0 answers
#bb #heterozygous #homozygous 

A horse sperm cell has a haploid number of 32 chromosomes. Complete the following table by stating 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 Mitosis   Telophase I  Telophase II  Telophase  Number of Cells        number of chromatids       Number of Chromosomes       

Posted 1 week ago by miyaomar in Biology 30 | 1 answers
#ovum being fertilized by multiple sperm cells #chromosomes #chromatids 

 
 
 
 
 
Theoretically, what is the expected result from the parental cross of a grey mouse and an albino mouse, and why does the expected result not match the result stated in the information given above?
Select one:
Theoretically, 100% of the mice should have grey coats so all 38 offspring should have grey coats. There was an experimental error that can account for the deviation.
Theoretically, there should be a 3:1 ratio of grey mice to albino mice, or 28.5 grey coat mice and 9.5 albino mice. There was an experimental error that can account for the deviation.
Theoretically, there should be a 3:1 ratio of grey mice to albino mice, or 29 grey coat mice and 9 albino mice. With more litters, the actual results would match the expected results more closely.
Theoretically, there should be a 1:1 ratio of grey mice to albino mice, or 19 grey coat mice and 19 albino mice. With more litters, the actual results would match the expected results more closely.
 
 
 
In mice, albinism (g) is recessive to grey coat colour (G). A grey mouse mated with an albino mouse. Over the course of several months, 38 pups were born. Out of 38 pups, 17 had a grey coat, and 21 were albino. Which of the following rows correctly identifies the parental and F1 generation genotypes?
Select one:
a.  Parental Cross  F1 Genotypes    Gg and gg 
b.  Parental Cross  F1 Genotypes    GG and Gg 
c.  Parental Cross  F1 Genotypes  Gg 
d.  Parental Cross  F1 Genotypes    GG, Gg and gg 

Posted 1 week ago by miyaomar in Biology 30 | 0 answers
#mice #punnet #f1 generation 

In garden pea plants, an inflated pod shape (I) is dominant over a pinched pod (i). The cross between two true breeding inflated pods can be represented by
Select one:
 IIII
IIii
Iiii
 IiIi
 iiii

Posted 1 week ago by miyaomar in Biology 30 | 1 answers
#punnet #true breeding #pods 

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 1 week ago by miyaomar in Biology 30 | 1 answers
#genetics #geno #dominate 

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 1 week ago by miyaomar in Biology 30 | 1 answers
#males #genetics #diploid 

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