AP Bio Unit 5: Heredity

5.0(1)
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/45

flashcard set

Earn XP

Description and Tags

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

46 Terms

1
New cards

Meiosis

a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes

2
New cards

Mitosis

a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

3
New cards

Sex Cells

Meiosis only happens in these cells

4
New cards

Crossing over

Scrambling genetic information by overlapping chromosomes and exchanging

5
New cards

Haploid

Meiosis reduces the number of chromosome sets from diploid to _______

6
New cards

Gametes

The result of meiosis: sperm or egg

7
New cards

Meiosis I

The first part of MeiosisM

8
New cards

Meiosis II

The second part of Meiosis

9
New cards

Prophase I

Duplicated Homologous Chromosomes pair and exchange segments (cross over) (2n)

10
New cards

Tetrad

During crossing over/synapsis, homologous chromosomes connect to form this

11
New cards

Metaphase I

Chromosomes are arranged at the metaphase plate → 1 pair facing each pole (Diploid)

12
New cards

Anaphase I

Each pair of homologous chromosomes separates

Sister chromatids remain attached to each other

13
New cards

2 Haploid

During Telophase I and cytokinesis, __________ cells form

each half of the cell has a complete set of duplicated chromosomes

14
New cards

Prophase II

Cells are completely split

Cells have a haploid set of duplicated chromosomes

15
New cards

Metaphase II

Chromosomes are positioned at the metaphase plate

2 Sister chromatids are not identical due to crossing over

16
New cards

Anaphase II

 Sister Chromatids Separate

Chromosomes move toward opposite poles

17
New cards

Genetically Distinct

At the end of Meiosis II, during Telophase and cytokinesis, Haploid Daughter cells are formed (gametes), and they are all _________

18
New cards

Half

Gametes have _____ the amount of chromosomes as their parent

19
New cards

Genetic Variation

This contributes to evolution and resilience and would not be possible without Meiosis

20
New cards

Random Fertilization

This makes it impossible to determine which gamete will be fertilized and increases genetic diversity

21
New cards

Nondisjunction

the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei.

22
New cards

Mendel’s Laws

These laws concern the inheritance of traits and genes

23
New cards

Law of Dominance

2 alleles: some will always be expressed, others only if both are non-dominant (dominant vs recessive)

24
New cards

Law of Segregation

An individual who is heterozygous sometimes passes on the dominant, and sometimes the recessive trait

  • Gametes cause only ½ of the genetic information to be passed on

    • 2 of the same allele separate before genetic formation

25
New cards

Independent Assortment

Passing on one allele does not impact passing on another (separate → any combination)

26
New cards

Fertilization

Fusion of 2 haploid gametes → restore diploid number of chromosomes

  • New combination of alleles in zygotes increase genetic diversity

  • Rules of probability may be applied (expression chance depends on gene frequencies)

    • Pattern of inheritance may often be predicted

27
New cards

Linked Genes

These genes are close together on a chromosome, highly increasing their chances of being passed on together

28
New cards

9:3:3:1

Ratio associated with a dihybrid cross

29
New cards

Incomplete Dominance

Non-Mendelian Genetics

heterozygous phenotype is intermediate between homozygous phenotypes

30
New cards

Multiple Alleles

Non-Mendelian Genetics

existence of several known alleles for a gene (ie blood)

31
New cards

Polygenic

Non-Mendelian Genetics

2 or more genes affect a single phenotypic character (ie skin)

32
New cards

Pleiotropy

Non-Mendelian Genetics 

one gene affects organism in many ways (ie sickle cell anemia)

33
New cards

Chromosomal Theory of Inheritance

This theory states that chromosomes are the vehicles of genetic heredity. Neither Mendelian genetics nor gene linkage is perfectly accurate; instead, chromosome behavior involves segregation, independent assortment, and occasionally, linkage.

34
New cards

Recombination

the process by which DNA strands are broken and repaired, producing new combinations of alleles,

35
New cards

Genotype

Genetic Makeup of an organism

36
New cards

Phenotype

the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

37
New cards

Monohybrid

Cross of 2 individuals with homozygous genotypes (GG x gg)

38
New cards

Dihybrid

a cross with 2 hybrids that are heterozygous for alleles of two different genes

39
New cards

Sex-Linked

Genes found on an X or Y Chromosomes

40
New cards

Recombination Frequency

The frequency with which a single chromosomal crossing occurs between two genes during meiosis

41
New cards

Non Nuclear

the inheritance of genetic material not originating from the nucleus of the cell, but from the DNA found in the cytoplasm

42
New cards

No Plasticity

 Environment does not affect phenotype

43
New cards

Plasticity

Environment has some impact on phenotype

44
New cards

Highly Variable Plasticity

Environment has a profound impact on phenotypeS

45
New cards

Selective Pressure

any reason for organisms with certain phenotypes to have either a survival benefit or disadvantage.

46
New cards

Genetic Drift

Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.