Not that kind of jeans!

A second pair of genes!

Oh my FAMILY

TREE

Dominant?

Or maybe not

What will they inherit?

100 100 100 100 100

200 200 200 200 200

300 300 300 300 300

400 400 400 400 400

500 500 500 500 500

What is a gene?

Answer

• Segment of DNA that codes for a specific trait

An individual who has two different

alleles for a gene is _____________ .

Answer

• HETEROZYGOUS

If an allele does not affect the phenotype

of a heterozygous individual, the allele

is _________ .

Answer

• recessive

A striped fruit fly is crossed with a non-striped fly. N = non-striped is dominant n = striped is recessiveWhat is the genotype of the striped parent?

Answer

• nn

A striped fruit fly is crossed with a non-striped fly. All 100 offspring are non-striped.

N = non-striped is dominant n = striped is recessive

What is the genotype of the non-striped parent?

Answer

• NN

What is an allele?

Answer

• A form of a trait located at a gene. ( gene for blue eyes vs gene for brown eyes)

An individual who has two identical

alleles for a gene is __________ .

Answer

• homozygous

What does it mean if an allele

is dominant?

Answer

• It prevents (covers up) the other allele (recessive) from being expressed.

The ‘B’ gene controls the color of a dog’s coat. The ‘R’ gene controls the texture.Which alleles, B, b, R, and/or r, would occur in all the offspring of the following parents?

BbRR x bbRr

Answer

• R would be in each offspring

• b would also be in each offspring

The ‘B’ gene controls the color of a dog’s coat. The ‘R’ gene controls the texture.

Which trait would occur in all the offspring of the following parents?

bbRR x BbRr

Gene Dominant Recessive

Color B=Black b=White

Texture R=Rough r=Smooth

Answer

• ROUGH

What types of PEDIGREE is this?

Answer

• Autosomal dominant

What types of PEDIGREE is this?

Answer

• Autosomal recessive

What types of PEDIGREE is this?

Answer

• X-linked recessive

What types of PEDIGREE is this?

Answer

• X- linked dominant

The law of independent assortment describes the inheritance of genes on different chromosomes and the behavior of chromosomes at the beginning ofa. meiosis 1b. meiosis 2c. mitosisd. all of the above.

Answer

• Meiosis I

In a heterozygous individual, the

______________ allele determines the

phenotype.

Answer

If a heterozygous individual has a phenotype that is

intermediate between both types of homozygous

individual, the two alleles show _______ _______.

Answer

• Incomplete dominance

Type AB blood is an example of

______________.

Answer

• 2 co-dominant Alleles

• Both A and B are expressed

A child has a genetic disease caused by a single

gene. Neither parent has the disease. The allele that

causes the genetic disease is __________ .

Answer

An allele of a single gene causes a disease that affects many more males than females. This allele is

a. autosomal dominantb. autosomal recessivec. X-linked dominantd. X-linked recessive

Answer

• X-linked recessive

A daughter inheritsa. more genes from her motherb. more genes from her fatherc. one copy of each gene from her mother and one copy from her father

Answer

• C- duh

A man who is heterozygous for the albino allele is married to a woman who is homozygous for normal skin color (Aa x AA). What fraction of their children would you expect to be albino?

Answer

• O %

If a son has an X-linked condition (e.g. color blindness or hemophilia), he must have inherited the gene for this condition from his ________.

Answer

• momma

A mother has type O blood and her husband has type AB blood. What blood types can their children have?

Answer

• AO = type A

• BO = type B

• AB = type AB

• Oo = type o

Parents who are both heterozygous for the alleles for albinism (Aa x Aa) have 2 heterozygous children. Now, the mother is expecting fraternal twins. The most likely genotypes for these twins are ___ and ___.

Answer

• Heterozygous and heterozygous