Advanced Genetics Study Guide Part 1

A phenotype that results from a dominant allele must have at least _____ dominant allele(s) present in the parent(s).

1

Refer to Figure 12-1. If individual III-2 marries a person with the same genotype as individual I-1, what is the chance that one of their children will be afflicted with hemophilia? (Show a Punnett Square)

0%

A cross between a white rooster and a black hen results in 100% black offspring. WHen two of these black offspring are mated, the probable phenotypic ratio seen in their offspring would be __________. (Show a Punnet Square)

3 black : 1 white

If a female fruit fly heterozygous for red eyes (XRXr) crossed with a white-eyed male (XrY), what percent of their offspring would have white eyes? (Draw a Punnett Square)

50%

For the trait being followed in the pedigree, individuals II-1 and II-4 in Figure 12-1 can be classified as ____.

Carriers

When roan cattle are mated, 25% of the offspring could be red, 50% could be roan, and 25% could be white. Upon examination, it can be seen that the coat of a roan cow consists of both red and white hair. This trait is controlled by what?

Codominance

What is the relationship between individual I-1 and individual III-2 in figure 12-1?

Grandma to grand son

A human genetic disorder caused by dominant gene is ______________.

Huntington's Disease

What inheritance is shown when a red-flowering plant is crossed with a white-flowering plant and only pink-flowering plants are produced?

Incomplete Dominance

Two healthy parents produce a child with the genetic disorder of cystic fibrosis, which is the result of a recessive gene. What would be the best explanation for this inheritance? (Show a punnet square)

Mendelian

What is the probable mode of inheritance for the normal trait in Figure 12-3?

Mendelian Inheritance

A trait that has four alleles is said to have a what?

Multiple Allele trait

Eye color in humans is the result of ____ inheritance.

Polygenic

The 23rd pair of chromosomes that differ in males and females are called what?

Sex chromosomes

What type of inheritance pattern does the trait represented by the shaded symbols in Figure 12-1 illustrate?

Sex-Linked Trait

In humans, red-green blindness is _______________________.

Sex-Linked Traits

Because the gene for red-green color blindness is located on the X chromosome, it is normally not possible for which parent to pass the trait to which offspring?

The father to Son

The blood types A, B, AB, and O are the result of __________________ inheritance.

multiple allele trait

Royal hemophilia is the result of ___ inheritance

sex-linked trait