Test - Meiosis, Genetics/Heredity Flashcards

1
Q

What did Mendel use pea plants for?

A

To study inherited traits

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1
Q

TT and tt are both

A

Homozygous

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1
Q

How are genotype and phenotype different?

A

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

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1
Q

What is gained from polygenic traits?

A

Variation

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1
Q

Describe the difference between haploid and diploid.

A

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)

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2
Q

What are the products of mitosis?

A

Somatic cells that are identical to each other and the mother cell (original cell)

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3
Q

How is codominance different that regular dominance?

A

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)

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3
Q

What is a pedigree? What is it used for?

A

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

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4
Q

A Punnett square is able to tell us

A

The possible outcomes for offspring

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4
Q

How many chromosomes do humans have?

A

46

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5
Q

What is a karyotype? What is it used for?

A

A picture of the autosomes and sex chromosomes

It can be used to show if there is an extra or missing chromosome

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6
Q

Compare and contrast gametes and somatic cells

A

Gametes - sex cells, sperm and egg cells, haploid, produced during meiosis

Somatic cells - body cells (nose, eye, etc), diploid, produced during mitosis

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7
Q

What would the results be of a cross between Tt and Tt?

A

TT, Tt, Tt, and tt

(Be able to do a Punnett square for this)

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7
Q

What makes a male a male? What makes a female a female?

(chromosome wise)

A

Male - XY

Female - XX

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9
Q

What are linked genes?

A

Genes that are located on the same chromosomes (autosomes)

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11
Q

Give some examples of polygenic traits

A

Hair color, skin color, eye color

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13
Q

What is nondisjunction?

A

When chromosomes do not pull apart correctly during meiosis

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13
Q

What is a DNA Fingerprint?

A

The genetic makeup of an individual

No 2 people (except identical twins) have exactly the same DNA

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14
Q

The Principle of Dominance states what?

A

Some alleles are dominant while other alleles are recessive

(Some traits will always show and mask other alleles)

15
Q

What are sex-linked genes?

A

Genes found on the X or Y chromosome

17
Q

What are traits?

A

Quality or characteristic (looks)

18
Q

What does a phenotypic ratio of a dihybrid cross tell us?

A
  1. The probabilty of possible offspring having both dominant traits
  2. The probability of possible offspring having the first dominant trait and the second recessive
  3. The probability of possible offspring having the first recessive trait and the second dominant
  4. The probability of possible offspring having both recessive traits
19
Q

What are some examples of traits with multiple alleles?

A

Blood type, patterns of color, spots on a dog

20
Q

Which chromosomes undergo crossing over?

A

Tetrads/Homologous pairs

22
Q

Identify what is being depicted in this picture.

A

Crossing over

23
Q

If an organism normally contains 16 chromosomes, what are the organisms haploid and diploid numbers?

A

Diploid - 16
Haploid - 8

24
Q

What are the products of meiosis?

A

4 gametes, DIFFERENT from each other, each with 1/2 the number of chromosomes (haploid)

25
Q

What are the possible genotypic and phenotypic combinations for blood type?

A

Type A - AA and Ai (AO)
Type B - BB and Bi (BO)

Type AB - AB
Type O - ii (OO)

Can also be written

Type A - IAIA and IAi
Type B - IBIB and IBi
Type AB - IAIB

26
Q

The result of a cross between parents with different traits

A

Hybrids (ex. Tt)

27
Q

A unit of heredity that is passed from parent to offspring and determines a characteristic of the offspring

A

Gene

28
Q

Alleles

A

Letters representing genes (ex. T, t)

30
Q

What process is used to change the DNA or an organism?

A

Genetic engineering

(ex. glowing cats)

31
Q

How many cells are produced during mitosis and meiosis?

A

During mitosis - 2
During meiosis - 4

32
Q

What is selective breeding?

A

Humans pick who breeds for a specific trait

Ex. Breeding dogs

33
Q

Different letters

A

Heterozygous (Tt)

35
Q

What is special about incomplete dominance?

A

With incomplete dominance, neither dominant trait can mask the other so there is a blending of the two traits

Ex. Red flower x white flower = pink flower

36
Q

Tt are genes for someone that is

A

Heterozygous (a hybrid)

37
Q

What can’t a Punnett square tell us?

A

The actual results of a genetic cross

38
Q

What is a somatic cell?

A

A regular body cell (brain cell, heart cell, nose cell, etc)

40
Q

What was Mendel able to conclude from his study of pea plants?

A

That traits are inherited from parents to offspring

41
Q

What was the Human Genome Project?

A

The sequencing of all human DNA

42
Q

Same letters

A

Homozygous (TT or tt)

43
Q

Erminette offspring are showing what type of dominance?

A

Codominance

44
Q

What kinds of traits are controlled by more than one gene?

A

Polygenic traits

45
Q

Where on most sex-linked traits found?

A

On the X chromosome only.