DE Non-Mendelian Genetics

Two genes that are close together on the same chromosome are said to be ___ and are ___ likely to be inherited together than ___ genes.

• linked; less; unlinked

• linked; more; unlinked

• unlinked; less; linked

• unlinked; more; linked

Sex-linked recessive traits in humans are ___ likely to be expressed in ___.

• less; males

• more; females

• more; males

• equally; both males and females

An example of a trait that involves multiple gene inheritance in plants is seed size. If seed size involves three genes (A, B, and C), in which each dominant allele contributes to increased seed size, which of the following genotypes would result in the smallest seed?

• AABBCC

• AaBBCc

• AaBbCC

• AaBbCc

In Drosophila (fruit flies), females have two XX chromosomes and males have one X chromosome and one Y chromosome. The eye color gene is located on the X Chromosome, and the red-eyed allele is dominant to the white-eyed allele. A heterozygous, red-eyed female is mated with a white-eyed male. Which of the following is the most likely result in their offspring?

• All females are red-eyed, and all males are white-eyed.

• All females are red-eyed, 50% of males are red-eyed, and 50% of males are white-eyed.

• 50% of females are red-eyed, 50% of females are white-eyed, and all males are white-eyed.

• 50% of both sexes are red-eyed, and 50% of both sexes are white-eyed.

In humans, blood type is determined by three alleles: IA, IB, and i. IA and IB are codominant, while i is recessive. If a person with blood type AB has a child with a person with blood type O, what is the probability that their child will have blood type A?

• 0%

• 25%

• 50%

• 100%

The heterozygotes resulting in a cross between two purebreds has a phenotype that resembles an intermediate form between the two parents. 

• Incomplete Dominance
• Complete dominance
• Co - Dominance 
• Multiple Alleles

This pattern of inheritance usually results in a normal bell curve of variation in a given population, like the inheritance of height 

• Pleiotropy
• Polygenic Inheritance
• Multiple alleles
• Incomplete Dominance

This pattern of inheritance is when one gene or mutation can have multiple phenotypic effects

• Multiple alleles
• Polygenic inheritance
• Pleiotropy
• Codominance

Most real-world characteristics are determined not just by genotypes, but also by environmental factors that influence how genotype is translated into phenotype. TRUE or FALSE

• TRUE

• FALSE

In a dihybrid cross if you get 9:3:3:1 ratio, it denotes that

• The alleles of two genes are interacting with each other

• Its multigenic inheritance

• It exhibits multiple allelism

• The alleles of two genes are segregating independently