Front

What is incomplete dominance in genetics?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two traits. For example, crossing a red snapdragon (RR) with a white snapdragon (rr) results in pink offspring.

Front

What is the probability of a child having hemophilia if the mother is a carrier and the father is normal?

Back

There is a 25% chance that the child will have hemophilia. This is because the mother can pass on the hemophilia allele (X^h) or the normal allele (X) and the father can only pass on the normal allele (Y).

Front

What is the genotype of an organism with two recessive alleles for a trait?

Back

The genotype is 'aabb', where 'aa' represents one trait and 'bb' represents another trait, both being recessive.

Front

What are nucleotides?

Back

Nucleotides are the basic building blocks of DNA and RNA, consisting of a sugar, a phosphate group, and a nitrogenous base.

Front

What is nondisjunction?

Back

Nondisjunction is the failure of sister chromatids to separate properly during cell division, leading to an abnormal number of chromosomes in the resulting gametes.

Front

What is a carrier in genetics?

Back

A carrier is an individual who has one copy of a recessive allele that does not manifest in their phenotype but can be passed on to offspring.

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed in the phenotype even when only one copy of the allele is present, while recessive traits are only expressed when two copies of the allele are present.

Front

What is the role of meiosis in heredity?

Back

Meiosis is the process of cell division that produces gametes (sperm and eggs) with half the number of chromosomes, ensuring genetic diversity through recombination and independent assortment.

Front

What is the significance of crossing over during meiosis?

Back

Crossing over is the exchange of genetic material between homologous chromosomes during meiosis, which increases genetic variation in the offspring.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.