4.6.1 reproduction Flashcards

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1
Q

Sexual reproduction involves?

A

the joining (fusion) of male and female
gametes

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2
Q

in animals

A

sperm and egg cells

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3
Q

in plants

A

pollen and egg cells

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4
Q

what is there in sexual reproduction and what does it lead to?

A

In sexual reproduction there is mixing of genetic information which
leads to variety in the offspring

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5
Q

The formation of gametes involves?

A

gametes

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6
Q

Asexual reproduction involves

A

only one parent and no fusion of
gametes

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7
Q

in asexual reproduction, there is no mixing of genetic information. what does this lead to?

A

This leads to
genetically identical offspring (clones).Only mitosis is involved.

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8
Q

meiosis ?

A

halves the number
of chromosomes in gametes

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9
Q

fertilisation?

A

restores the full
number of chromosomes.

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10
Q

Cells in reproductive organs divide by?

A

meiosis to form gametes.

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11
Q

When a cell divides to form gametes:

A

copies of the genetic information are made
* the cell divides twice to form four gametes, each with a single
set of chromosomes

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12
Q

all gametes are?

A

genetically different from each other

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13
Q

Gametes join at fertilisation to?and the new cell divides by?

A

restore the normal number of
chromosomes.
The new cell divides by mitosis.The number of cells
increases

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14
Q

As the embryo develops?

A

cells differentiate

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15
Q

The genetic material in the nucleus of a cell is composed of

A

a chemical called DNA

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16
Q

what is DNA?

A

DNA is a polymer made up of two strands
forming a double helix

17
Q

. The DNA is contained in structures called?

A

chromosomes

18
Q

what is a gene?

A

A gene is a small section of DNA on a chromosome

19
Q

what does a gene do?

A

Each gene codes for a particular sequence of amino acids, to make a specific
protein.

20
Q

what is the genome of an organism?

A

The genome of an organism is the entire genetic material of that
organism

21
Q

has the whole genome been studied?

A

The whole human genome has now been studied and
this will have great importance for medicine in the future.

22
Q

what is he importance of
understanding the human genome?

A

search for genes linked to different types of disease
* understanding and treatment of inherited disorders
* use in tracing human migration patterns from the past.

23
Q

Some characteristics are controlled by a single gene, such as:

A

fur
colour in mice; and red-green colour blindness in humans

24
Q

different forms of the same gene is called?

A

alleles

25
Q

The alleles present, or genotype, operate at?

A

a molecular level to
develop characteristics that can be expressed as a phenotype.

26
Q

dominant allele

A

A dominant allele is always expressed, even if only one copy is
present

27
Q

recessive allele

A

A recessive allele is only expressed if two copies are
present (therefore no dominant allele present)

28
Q

homozygous

A

If the two alleles present are the same the organism is homozygous
for that trait

29
Q

heterozygous

A

if the alleles are different they are heterozygous

30
Q

In females the sex chromosomes are the same

A

(XX).

31
Q

In males the chromosomes are different

A

XY

32
Q

22 pairs control characteristics only, but one of the pairs carries the
genes that determine?

A

sex