B1- You and your genes (B1.2)

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

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
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all You and your genes resources »