Genetics TEST Review

Genetics TEST Review Biology 2010

10 What are non sex chromosomes called? • Homologous • Diploid • Autosomes • Haploid

A mule is the result of a cross between a donkey and a horse. A mule is a • tetrad. • phenotype. • genotype. • hybrid. :10

The failure of chromosomes to separate during meiosis is called • nondisjunction. • X-chromosome inactivation. • Turner’s syndrome. • Down syndrome. :10

Shaded symbols represent afflicted people. Males are squares; women are circles. If the trait is a sex-linked trait carried on the X chromosome, what is true about the mother represented by circle 1 • She has two alleles for the disorder. • She has one allele for the disorder. • She has no alleles for the disorder. • She has the genotype XXY. :10

How many generations are shown in the pedigree • 2 • 4 • 6 • 8 :10

The trait has two alleles: P (dominant) and p (recessive). The black symbols show the dominant phenotype, and the white symbols show the recessive phenotype. What is the genotype of individual number 4? • PP • Pp • P • pp :10

The allele for the trait in the pedigree is dominant. What is the probability of the couple labeled 2 of having a child with the trait? • 25% • 50% • 75% • 100% :10

If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring’s blood type? • AB or O • A, B, or O • A, B, AB, or O • AB only :10

Which of the following statements is true? • Females cannot have hemophilia. • A colorblind girl’s father must be colorblind. • A sex-linked allele cannot be dominant. • A colorblind boy’s father must be colorblind. :10

Colorblindness is more common in males than in females because the allele for colorblindness is • dominant and located on the X chromosome. • recessive and located on the Y chromosome. • recessive and located on the X chromosome. • dominant and located on the Y chromosome. :10

:10 What is used to determine if a child has a genetic disorder or gender • Haploid • Dipolid • Binary fission • Karyotype

Sex-linked genes are located on • the autosomal chromosomes. • the X chromosome only. • the Y chromosome only. • both the X chromosome and the Y chromosome. :10

How many TOTAL chromosomes are shown in a normal human karyotype • 2 • 23 • 44 • 46 :10

True or False- Karyotype can only show a child's gender • True • False :10

ID the child • Klinefelter, male • Klinefelter, female • Turner syndrome, male • Turner syndrome, female • Normal boy • Normal girl :10

what is the approximate probability that a human offspring will be male? • 10% • 25% • 50% • 75% :10

Human males produce sperm cells that have • one X chromosome. • two X chromosomes. • one X or one Y chromosome. • one X and one Y chromosome. :10

Variation in human skin color is an example of • incomplete dominance. • codominance. • polygenic traits. • multiple alleles. :10

A cross of a black cat (BB) with a white cat (bb) produces all speckled offspring (Bb). This type of inheritance is known as • incomplete dominance. • polygenic inheritance. • codominance. • multiple alleles. :10

one allele for a gene is not completely dominant over another allele for that gene are called • Complete dominance. • incomplete dominance. • co dominant. • multiple genes. :10

Gregor Mendel’s principles of genetics apply to • plants only. • animals only. • pea plants only. • all organisms. :10

T/F when doing a dihybrid cross – traits are independently assorted • True • False :10

which of the following is true about the offspring resulting from the cross? • About half are expected to be short. • All are expected to be short. • About three fourths are expected to be tall. • All are expected to be tall. :10

Organisms that have two identical alleles for a particular trait are • hybrid. • homozygous. • heterozygous. • dominant. :10

When the two alleles are different • hybrid. • homozygous. • heterozygous. • dominant. :10

T/F A genotype is the physical traits • True • False :10

A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be short is • 25%. • 50%. • 75%. • 100%. :10

probability can be used to • determine the actual outcomes of genetic crosses. • determine which species should be used in genetic crosses. • decide which organisms are best to use in genetic crosses. • predict the traits of the offspring of genetic crosses. :10

When you flip a coin, what is the probability that it will come up tails • 1 • 1/2 • 1/4 • 1/8 :10

In the P generation, a tall plant was crossed with a short plant. Short plants reappeared in the F2 generation because • the allele for shortness becomes more common in the F2 generation. • the alleles for both heights were present in the F1 plants. • the allele for shortness becomes dominant in the F2 generation. :10

If a pea plant’s alleles for height are tt. What could we conclude about the parents? • Both parents were tall. • Both parents were short. • Both parents contributed a recessive allele. • Both parents contributed a dominant allele. :10

Questions about a Karyotype? • What term do we use to describe the pair of chromosomes? • How are the chromosomes that make up each number pair similar? • What chromosomes are autosomes? • Which are sex chromosomes? • Can you explain any abnormalities? Chapter 11 and 14 Genetics 2010

Attached earlobes are recessive, person number 2 must be • Heterozygous • Homozygous dominant • Homozygous recessive :10

What would the genotype of 14 • EE • Ee • ee :10

How many possible phenotypes are there? • 1 • 2 • 3 • 4 • 10 :10

Genetics TEST Review