Test - Meiosis, Genetics/Heredity Flashcards
What did Mendel use pea plants for?
To study inherited traits
TT and tt are both
Homozygous
How are genotype and phenotype different?
Genotype - the letters representing genes
ex. TT, Tt, tt, RR, Rr, rr… etc
Phenotype - how genotype is expressed, the looks
ex. Tall, short, round, wrinkled
What is gained from polygenic traits?
Variation
Describe the difference between haploid and diploid.
Haploid - represented by N, contains half the number of chromosomes (in humans 23)
Diploid - represented by 2N, contains the full count of chromosomes (in humans 46)
What are the products of mitosis?
Somatic cells that are identical to each other and the mother cell (original cell)
How is codominance different that regular dominance?
With codominance, the both traits are dominant and they share the look
Ex. Black chicken x white chicken = black AND white chicken
(Checkered chicken, Erminette chicken)
What is a pedigree? What is it used for?
It’s a family tree that shows traits through generations
It is used to determine whether traits are inherited, show how traits are passed on, and show dominant and recessive individuals
A Punnett square is able to tell us
The possible outcomes for offspring
How many chromosomes do humans have?
46
What is a karyotype? What is it used for?
A picture of the autosomes and sex chromosomes
It can be used to show if there is an extra or missing chromosome
Compare and contrast gametes and somatic cells
Gametes - sex cells, sperm and egg cells, haploid, produced during meiosis
Somatic cells - body cells (nose, eye, etc), diploid, produced during mitosis
What would the results be of a cross between Tt and Tt?
TT, Tt, Tt, and tt
(Be able to do a Punnett square for this)
What makes a male a male? What makes a female a female?
(chromosome wise)
Male - XY
Female - XX
What are linked genes?
Genes that are located on the same chromosomes (autosomes)
Give some examples of polygenic traits
Hair color, skin color, eye color
What is nondisjunction?
When chromosomes do not pull apart correctly during meiosis
What is a DNA Fingerprint?
The genetic makeup of an individual
No 2 people (except identical twins) have exactly the same DNA