3.4 IB Inheritance

Front

What is colorblindness and why is it more common in males?

Back

Colorblindness is a recessive condition located on the X chromosome, making it more common in males who have only one X chromosome.

Front

What does the Law of Independent Assortment state?

Back

The Law of Independent Assortment states that alleles for different traits segregate independently of one another during gamete formation.

Front

What genotype represents a female who is a carrier for hemophilia?

Back

X^H X^h

Front

If a female carrier for color blindness has children with a male with normal vision, what is the probability that a son will be colorblind?

Back

50% of the male children will statistically be colorblind.

Front

Which genetic cross could NOT produce a child with blood type A?

Back

I^A I^A x I^B I^B cannot produce a child with blood type A.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even if only one copy is present, while recessive alleles require two copies to express their trait.

Front

Define sex-linked traits.

Back

Sex-linked traits are characteristics determined by genes located on the sex chromosomes, often affecting males and females differently.

Front

What is the significance of the X chromosome in inheritance?

Back

The X chromosome carries many genes, including those for sex-linked traits, and males have only one X chromosome, making them more susceptible to X-linked disorders.

Front

Explain the concept of a carrier in genetics.

Back

A carrier is an individual who has one copy of a recessive allele for a trait but does not express the trait themselves.

Front

What is the role of alleles in inheritance?

Back

Alleles are different versions of a gene that determine specific traits, and individuals inherit one allele from each parent.