Genetics Knowledge Trivia! 7th Grade Quiz

Explanation
If both parents are heterozygous, it means that they have one dominant and one recessive allele for a particular trait. When they reproduce, each parent can pass on either the dominant or the recessive allele to their offspring. Since there are two possible alleles that can be passed on, and each parent can contribute one allele, there are four possible combinations for the offspring: dominant-dominant, dominant-recessive, recessive-dominant, and recessive-recessive. Out of these four combinations, two of them (dominant-recessive and recessive-dominant) result in heterozygous offspring. Therefore, 50% of the offspring will be heterozygous.

Explanation
The genotype BB is an example of homozygous dominant because both alleles in the genotype are dominant (represented by the capital letter B), meaning that they will express their trait. Homozygous means that both alleles in the genotype are the same, in this case, both are dominant. Therefore, BB is an example of homozygous dominant.

Explanation
The easiest way to try and determine which trait is dominant in a species is to see what trait is most common. By observing the frequency of a particular trait in a population, we can infer that it is likely the dominant trait. This method does not require any complex scientific techniques or experiments, making it a simple and straightforward approach to determining dominance.

Explanation
If both parents are heterozygous, it means that they carry one copy of the albino gene and one copy of the wild-type gene. When these two parents reproduce, there is a chance that they will pass on the albino gene to their offspring, resulting in an albino axolotl. This is because the albino gene is recessive, meaning that it only manifests when an individual has two copies of the gene. Therefore, both parents need to carry the albino gene in order for there to be a possibility of producing an albino offspring.

Explanation
The genetic information in a cell is stored in the nucleus. The nucleus contains the cell's DNA, which carries the instructions for the cell's functions and characteristics. The DNA is organized into chromosomes and is protected within the nucleus. The other options mentioned, such as ribosomes, cell membrane, and vacuole, do not store genetic information. Ribosomes are responsible for protein synthesis, the cell membrane is a protective barrier, and vacuoles store water and other substances.

Explanation
The dominant phenotype for human eye color is brown. This means that if an individual has the genotype BB or Bb, they will have brown eyes. The presence of the dominant allele B overrides the recessive allele b, which is associated with blue eye color. Therefore, individuals with the genotype bb will have blue eyes.

Explanation
The genotype Bb is heterozygous because it contains two different alleles, B and b. In genetics, heterozygous refers to an individual having two different alleles for a particular gene. In this case, Bb indicates that the individual has one dominant allele (B) and one recessive allele (b) for a specific trait.

Explanation
The most likely genotype of the wild type axolotl is BB. This is because the wild type phenotype is dominant, and if all the offspring are wild type, it means that they have received a dominant allele from both parents. Therefore, the wild type axolotl must have a homozygous dominant genotype (BB).

Explanation
When two albino axolotls reproduce, they can only pass on the albino gene to their offspring. The genotype for the albino gene is represented by "bb". This means that the only possible genotype that can occur in the offspring is "bb".

Explanation
When one parent is homozygous recessive (rr) and the other parent is heterozygous (Rr), the Punnett square can be used to determine the possible genotypes of their offspring. The possible combinations are Rr and rr, with a 50% chance of each. Since rr represents the homozygous recessive genotype, the percentage of offspring that will be homozygous recessive is 50%.