Question

In genetics, letters are used to represent alleles. In the examples below, Q and q represent the alleles for a specific gene. Questions may have more than one answer.

1- Which of the genotypes could represent alleles in a diploid cell? QQ, Q, Qq, q, qq

2- Which of the genotypes could represent alleles in a haploid cell? QQ, Q, Qq, q, qq   

3- Which of the genotypes could represent an individual that is homozygous for the trait? QQ, Q, Qq, q, qq

4- Which letter represents a dominant allelle? QQ, Q, Qq, q, qq

5- Which letter represents a recessive allelle? QQ, Q, Qq, q, qq

Determine whether each statement is true or false.

6- A genotype is controlled by the sex cells combining to form an organism. true or false

7-  The organism's phenotype is responsible for determining the organism’s genotype. true or false

8- An male organism whose genotype is homozygous for a trait will produce sperm with 2 differing alleles for the specific trait. true or false

9- Alleles are identical in an individual that is homozygous for a trait. true or false

Use the information below to answer the questions concerning Pigeonetics (pigeon genetics).

Pigeons are birds in the dove family. They are stocky birds with short necks and a slender beak. Pigeons feed primarily on vegetation, however they consume human food as well. Pigeons are the oldest domesticated bird and much study has been dedicated to pigeon characteristics. Many people breed and race their pigeons, known as homing pigeons. Smokey is the gene responsible for the "slate" color of homing pigeons. It is a simple autosomal recessive gene. We will use the letter "t" to represent the allele.

Question 11 If your pigeon has the slate color, what is its genotype? TT, Tt, tt, T, t

Question 12- Approximately 50% of pigeons are carriers of the slate coloring (though they aren't slate color). What is the genotype of a pigeon that is a carrier for the slate allele? TT, Tt, tt, T, t Grant would like to sell homing pigeons. He can get more money for birds that are slate colored. He is going to mate his smartest pigeons, Heather and Keith. Heather is not slate colored, but some of her offspring are. Keith is slate colored. 13- What is Heather's genotype? TT, Tt, tt, T, t 14- What is Keith's genotype? TT, Tt, tt, T, t 15- Clearly explain how you determined their genotype. 16- If Heather and Keith have eight eggs, how many would you predict to be slate colored? 0, 2, 4, 6, 8

Answer 1

1. QQ, Qq, qq

Diploid individuals have 2 alleles for each gene.

2. Q, q

Haploid individuals have one allele for each gene.

3. QQ, qq

Homozygotes have two same alleles for every gene.

4. Q

Dominant allele by convention is shown by capital letter.

5. q

Recessive allele by convention is shown by small letter.

6. True

Sex cells or gametes carry all the information which is passed on from generation to the other.

7. False

An organism's genotype is responsible for determining its phenotype.

8. False

The sperms will have same allele.

9. True

Homozygous individuals have same alleles whereas heterozygotes have different alleles.

Please rate high.