Exam 9: Patterns of Inheritance

Imagine that beak color in a finch species is controlled by a single gene.You mate a finch homozygous for orange (pigmented)beak with a finch homozygous for ivory (unpigmented)beak and get numerous offspring,all of which have a pale,ivory- orange beak.This pattern of color expression is most likely to be an example of

Most people afflicted with recessive disorders are born to parents who were

Varieties of plants in which self- fertilization produces offspring that are identical to the parents are referred to as

Which of the following statements regarding cross- breeding and hybridization is false?

Which of the following is essentially the opposite of pleiotropy?

How many sex chromosomes are in a human gamete?

Amniocentesis and chorionic villus sampling allow for _ and _ of the fetus so that it can be tested for abnormalities.

Which of the following kinds of data could be used to map the relative position of three genes on a chromosome?

The mechanism that "breaks" the linkage between linked genes is

A person with AB blood illustrates the principle of

Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50%,what is the probability that a couple's first- born child will be female and that their second- born child will be male?

Research since Mendel's time has established that the law of the segregation of genes during gamete formation

Mendel conducted his most memorable experiments on

All the offspring of a cross between a red- flowered plant and a white- flowered plant have pink flowers.This means that the allele for red flowers is to the allele for white flowers.

You conduct a dihybrid cross.A ratio would make you suspect that the genes are linked.

A color- blind woman marries a man who is not color- blind.All of their sons,but none of their daughters,are color- blind.Which of the following statements correctly explains these results?

Which of the following statements regarding sickle- cell disease is false?

Which plants in this figure must all be heterozygous?

A monohybrid cross is

Most genetic disorders of humans are caused by