Punnett Squares
Chromosomal Abnormalities
Meiosis
Vocabulary/Terms
Incomplete/Co-dominance Inheritance
100
When the genotype consists of a dominant and a recessive allele, which allele will be shown in the phenotype?
The dominant allele
100
Which abnormality is characterized by a high, cat like voice?
Cri du Chat Syndrome
100
What are the products of Meiosis called?
Gametes
100
What is the difference between Homozygous and Heterozygous?
Homo- = when two alleles match or are the same (DD and dd)
Hetero- = when they aren't the same (Dd)
100
What type of inheritance do two alleles have if their traits blend together?
Incomplete Dominance
200
A cross between true (homo)-breeding green and yellow plants (green pea color is dominant) results in __________.
All green plants
200
What genetic disorder results from three copies of chromosome 21?
Down Syndrome or Trisomy 21
200
Occurs when nonsister chromatids of homologous chromosomes exchange genetic information, results in a new combination of genes.
Crossing Over
200
What is a gene?
A part of a DNA molecule which determines a certain trait.
200
A plant shows incomplete dominance in size. A tall plant (TT) is crossed with a medium plant (TS). What fraction of plants will also be tall?
50%
300
In dogs, there is a hereditary deafness caused by a recessive gene, “d.” A kennel owner has a male dog (Gilbert) that she wants to use for breeding purposes if possible. Gilbert can hear.
What are the two possible genotypes of Gilbert? __________ and _________
DD and Dd
300
What is a common side-effect of chromosomal abnormalities?
Infertility; Can't have children
300
How are the products of Mitosis and Meiosis different?
Mitosis = 2 Diploid (2n) cells
Meiosis = 4 Haploid (1n) cells
300
An organism's expressed physical traits, such as hair color or shape, are called its ____ .
Phenotype
300
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
Co-dominance
400
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability (%) of an offspring with the same phenotype as its parents in a cross between a homozygous black and a heterozygous black guinea pig.
100 %
400
What abnormality can be seen here?
Turner Syndrome
400
Why is crossing-over important?
It creates more genetically unique gametes / Increases genetic diversity
400
The idea that for any particular trait, the pair of alleles of each parent separate and only one allele from each parent passes to an offspring is Mendel's principle of _________________.
Segregation
400
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have pink (RW) flowers?
100%
500
Short hair is dominant over long hair in guinea pigs. A long-haired male guinea pig and a heterozygous short-haired female are kept in the same cage and mate numerous times, ultimately producing 32 total offspring. What is the most likely distribution of short hair and long hair among their offspring?
50% or half
500
What abnormality can be seen here?
Kleinfelter's Syndrome
500
What phase is represented?
Metaphase 1
500
In a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Which law is this?
Law of Dominance
500
A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
1:2:1 (orange:orange/white:white)