Two individuals of a rare animal species are mated. One is homozygous for brown eyes and the other is heterozygous. The recessive eye colour is grey. What is the probability that their offspring has brown eyes?

If a man who is a tongue roller (T) and has unattached ear lobes (E) marries a woman who cannot roll her tongue and has attached earlobes, could they have a child who is also a non-tongue roller with attached earlobes? What would be the genotype of the man and his wife?

The Law of Independent Assortment is not applicable for

A true-breed red flowered snapdragon is crossed with a true breed white flowered one. All of the F₁ have pink flowers. What does this say about the parent traits?

What is the possible phenotypic ratio of the children if the father has blood type AB the mother has blood type A with genotype I^Ai?

Determine the sequence of genes A, B, C, and D if the distance from A-C is 17 units, A-B is 25 units, A-D is 37 units, B-C is 8 units and B-D is 12 units. The order would be as follows:

In a Snapdragon plants, the allele for white flowers is recessive, while the allele for red flowers shows incomplete dominance when they are in heterozygous form. What is the expected ratio of the offspring when to heterozygous pink flowering plant are crossed?

What is the relationship between a gene and a DNA molecule?

A tomato plant is homozygous for allele R. How many copy of this allele would be found in a male gamete produced by this plant?

Why a tomato plant which is homozygous for allele r produce only one r allele in each gamete?

A tomato plant is homozygous for allele R. How many copies of this allele would be found in a leaf cell from this plant?

Why a tomato plant which is homozygous for allele r remain 2 copies of r allele in a leaf cell?

In tomatoes, the allele for tall plant, T is dominant for short plant, t, while the allele for red fruit, R is dominant for yellow fruit, r. The two genes concerned are on different chromosomes. The possible genotypes of the gametes of the plant chosen as the male parent were RT, Rt, rT and rt. What was the genotype and phenotype of this plant? (Question 14 to 20 related to the same situation)

In tomatoes, the allele for tall plant, T is dominant for short plant, t, while the allele for red fruit, R is dominant for yellow fruit, r. The two genes concerned are on different chromosomes. The possible genotypes of the gametes of the plant chosen as the female parent were rt and rT. What was the genotype and phenotype of this plant? (Question 14 to 20 related to the same situation)

A cross was made between two tomato plants. Tall plant, T is dominant for short plant, t, while the allele for red fruit, R is dominant for yellow fruit, r. What are genotypes of both parents which a male parent is heterozygous for both genes, while female parent is yellow fruit and heterozygous for tall? (Question 14 to 20 related to the same situation)

RrTt male plant and rrTt female plant are crossed together. What are the gametes produced from both parents? (Question 14 to 20 related to the same situation)

How many possible genotypes of offspring produced from a crossing between RrTt male plant and rrTt female plant? (Question 14 to 20 related to the same situation)

In tomatoes, the allele for tall plant, T is dominant for short plant, t, while the allele for red fruit, R is dominant for yellow fruit, r. What is phenotypic ratio of offspring produced from a crossing between RrTt male plant and rrTt female plant? (Question 14 to 20 related to the same situation)

In tomatoes, the allele for tall plant, T is dominant for short plant, t, while the allele for red fruit, R is dominant for yellow fruit, r. RrTt male plant and rrTt female plant are crossed together. What proportion of the offspring of this cross would you expect to have red fruit? (Question 14 to 20 related to the same situation)

In a population of cows at genetic equilibrium, 750 cows have long horns (dominant trait), while remaining 250 cows have short horns (recessive trait). What is the dominant allele frequency?

In a population of cows at genetic equilibrium, 1500 cows have dominant grey coat, while remaining 500 cows have recessive white coat. If all the white coat cows were sold, what is the frequency of dominant alleles in new population?

A study on 1000 mice about their resistance towards a type of poison was carried out. The resistance characteristic is controlled by dominant allele T. 51% of the mice population is found to be resistant towards the poison. Calculate number of mice expected to have genotype Tt.

Widow’s peak hairline in human is determined by a dominant allele. 6400 individuals in a population of 10 000 were found to have widow’s peak hairline. Determine the proportion of the population that is homozygous for the trait. Assume population is at Hardy-Weinberg equilibrium.

In a population of 200 small mammals, it is found that 36% of these animals are albino. The albinism is controlled by a recessive, r while brown fur is controlled by a dominant allele, R. By using the Hardy-Weinberg equation, calculate frequency of homozygous recessive. (Question 25 to 30 related to the same situation)

In a population of 200 small mammals, it is found that 36% of these animals are albino. The albinism is controlled by a recessive, r while brown fur is controlled by a dominant allele, R. By using the Hardy-Weinberg equation, calculate frequency of recessive allele. (Question 25 to 30 related to the same situation)

Frequency of recessive allele is 0.6. By using the Hardy-Weinberg equation, calculate frequency of dominant allele. (Question 25 to 30 related to the same situation)

In a population of 200 small mammals, it is found that 36% of these animals are albino. The albinism is controlled by a recessive, r while brown fur is controlled by a dominant allele, R. By using the Hardy-Weinberg equation, calculate frequency of heterozygous. (Question 25 to 30 related to the same situation)

In a population of 200 small mammals, it is found that 36% of these animals are albino. The albinism is controlled by a recessive, r while brown fur is controlled by a dominant allele, R. Calculate number of pure breed brown small mammals in the population. (Question 25 to 30 related to the same situation)

In a population of 200 small mammals, it is found that 36% of these animals are albino. The albinism is controlled by a recessive, r while brown fur is controlled by a dominant allele, R. A group of biologist had released 323 pure bred brown small mammals into the population. Predict the new number of pure bred brown small mammals. (Question 25 to 30 related to the same situation)

Which property of DNA enables it to replicate semi-conservatively?

A transcription unit that is 1200 nucleotides long may use 800 nucleotides to make a protein consisting of 400 amino acids. This is best explained by the fact that

A hormone molecule M is made up of 2 polypeptides chain; one chain contains 20 amino acids and the other chain contains 31 amino acids. What is the minimum number of nitrogenous bases in DNA required to code this hormone molecules?

Which statements are TRUE of transcription in eukaryotic cells? (the answer maybe more than ONE)

If a DNA strand reads TAC GGC ATG, then the RNA molecules created by transcription would read

Which of the following anticodons is NOT complementary to stop codons?

If enzyme X is coded by 53 codons, how many amino acids are there in the polypeptide chain?

If the DNA triplets are GTT ACG, the tRNA anticodons would be

Arrange the following events in the synthesis of a protein in the proper order.

1) a peptide bond is formed

2) a tRNA matches its anti-codon to the codon in the A site

3) a tRNA translocates from the A site to the P site

4) the large subunit attaches to the small subunit

5) a small subunit binds the mRNA and initiator tRNA

A segment of a certain polypeptide chain in an enzyme is made up of the following amino acid sequence.

…ileu – pro- ser- pro- cys-….

The tRNA anticodons that code for the amino acids are as follow.

UGC: cys CCG: pro UCG: ser AUU: ileu

What is the correct base of the DNA template that transcribed this enzyme?