Genetics and Biotechnology

In the blood, the protein hemoglobin can slowly convert to a different form. This other form, called methemoglobin, is normally converted back to hemoglobin by an enzyme. The pedigree for a family with a history of type 1 met-H is shown below in FIGURE 1. The pattern of inheritance for this form of met-H is autosomal recessive (allele m).

 Which of the following individuals could have the homozygous dominate genotype?

• Mark

• Bill

• Olivia

• Shawn

This diagram shows a diploid cell with two pairs of homologous chromosomes. Due to independent assortment, what is the possible genetic make-up of gametes produced by this organism?

• SsTt

• Ss, Tt

• S, s, T, t

• ST, St, sT, st

A student in genetics class is studying the inheritance patterns in fruit flies. He is looking at the traits for wing length, long versus short, and color, brown versus gray. Below you will see a dihybrid cross of two flies that were heterozygous for long wings and brown color. Long wings and brown are dominant.

 How many offspring will have long wings and gray color?

• 3

• 8

• 9

• 12

Which of the following statements best supports Mendel's Law of Segregation?

• Individual traits are inherited independently of one another.

• Dominant traits are always separated from recessive traits during reproduction.

• The individual alleles that make up a gene must separate during gamete formation.

• Breeding two individuals together always produces offspring with a recessive phenotype.

This diagram shows a pedigree for a recessive genetic disorder. What is the genotype of individual 6?

• X^HX^H

• X^HX^h

• X^HY

• X^hY

A boy has brown hair and blue eyes. His brother has brown hair and brown eyes. The fact that they have different combinations of traits is best explained by which concept?

• multiple alleles

• sex linkage

• independent assortment

• dominance

The table lists the trials for fruit color where allele R exhibits incomplete dominance over allele R'.  Heterozygous fruit have orange phenotypes. What percent of offspring are expected to have an orange phenotype if the parent plants are orange (RR') and yellow (R'R')?

• 25%

• 50%

• 75%

• 100%

One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria?

• 0%

• 50%

• 75%

• 100%

Use the chart to answer the question below

  

A man with type AB blood marries a woman with type O blood, whose father had type A blood. What is the probability of having a child with type A blood?

• 25%

• 50%

• 75%

• 100%

Height is controlled by multiple genes in the body. This describes which of the following inheritance pattern?

• Polygenic Inheritance

• Codominance Inheritance

• Incomplete Inheritance

• Dominance Inheritance