Genetic crosses Flashcards

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1
Q

Heredity

A

passing on of traits from parents to offspring my means of genes

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2
Q

somatic cells

A

non-sex cells eg.body cell

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3
Q

diploid

A

2 sets of chromosomes

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4
Q

haploid

A

contains 1 set of chromosomes

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5
Q

gamete

A

sex cell, haploid and capable of fusion

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6
Q

progeny

A

offspring

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7
Q

fetilisation

A

when two gametes fuse to form a zygote

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8
Q

Gene

A

section of Dna on a chromosome that contains information how to make a ptotein

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9
Q

gene expression

A

when the gene is made

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10
Q

alleles

A

different forms of the same gene

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11
Q

locus

A

position of a gene on a chromosome

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12
Q

Genotype

A

The genetic make up of the individual

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13
Q

phenotype

A

the physical apperance of an individial.
Phenotype = genotype + enviorment

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14
Q

Dominant gene/ allele

A

always expressed in the phenotype

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15
Q

recessive gene allele

A

prevented from being expressed by the dominant allele

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16
Q

homozygous

A

2 identical alleles

17
Q

heterozygous

A

when the 2 alleles are different

18
Q

homologous pair

A

a pair of chromosomes (one from each parent) of similar lenght that contain genes for the same traits at the same positions

19
Q

non allelic genes

A

genes coding for different traits

20
Q

monohybrid cross

A

cross that involves one trait

21
Q

who is known as the father of genetics

A

gregor mendel

22
Q

what is Mendel’s 1st law/ Law of segregation

A

2 alleles code for a trait. When gametes are formed, these alleles separate.
each allele goes to a different.
Rr —> (R) (r)

23
Q

Incomplete dominance

A

when two alleles battle for dominance, neither wins and an intermediate condition is reached.

24
Q

pedigree chart

A

shows the genetic history of a group of related individuals

25
Q

What is an autosome, how many pairs in humans?

A

any chromosome that is not a sex chromosome. 22 pairs of autosomes

26
Q

sex chromosome

A

a chromosome that dertimes the sex of an individual.

27
Q

what are the sex chromosome in humans

A

XX- female XY-male

28
Q

name examples of animals where the XY and XX chromosome give rise to a different sex

A

birds, butterflies and moths

29
Q

how many types of sperm are there

A

two types of sperm cell. X and Y

30
Q

how many types of egg cell are there?

A

one type of egg cell which is X

31
Q

dihybrid cross (non linked)

A

cross that involves two different traits that are located on different crosses

32
Q

linked genes

A

genes that are located on the same set of chromosomes