B1- You and your genes (B1.2)

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  • Created by: Mosope
  • Created on: 25-04-16 19:24
What type of chromosomes do body cells contain ?
pairs of chromosomes
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How many chromosomes do sex cells contain ?
one chromosome from each pair
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Where do chromosomes in a pair carry their genes ?
They carry the same genes in the same place
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What are alleles and how many do individuals have ?
different versions of the same gene and individuals usually have two alleles for each gene
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What does Homozygous mean?
you have two alleles the SAME for that particular gene
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What does Heterozygous mean?
you have two DIFFERENT alleles for that particular gene
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What happens during sexual reproduction ?
genes from both parents come together and produce variation in the offspring
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Why do offspring have some similarities to their parents ?
because of the combination of maternal and paternal alleles in the fertilised egg
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Why do different offspring from the same parent differ from each other ?
because they inherit different combinations of maternal and paternal alleles
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Alleles can be..... ?
Dominant or Recessive
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Both dominant alleles will show..... ?
dominant characteristics
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Both recessive alleles will show..... ?
recessive characteristics
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One recessive and one dominant alleles will show....?
dominant characteristics
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What are the human male sex chromosomes ?
XY
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What are the human female sex chromosomes?
XX
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What does the sex-determine gene on the Y chromosome trigger ?
the development of the testes
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What happens in the absence of a Y chromosome?
the ovaries develop
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What does the term Genotype describe ?
the genetic make-up of an organism (the combination of alleles)
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What does the term Phenotype describe ?
the observable characteristics that an organism has
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Other cards in this set

Card 2

Front

How many chromosomes do sex cells contain ?

Back

one chromosome from each pair

Card 3

Front

Where do chromosomes in a pair carry their genes ?

Back

Preview of the front of card 3

Card 4

Front

What are alleles and how many do individuals have ?

Back

Preview of the front of card 4

Card 5

Front

What does Homozygous mean?

Back

Preview of the front of card 5
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