Chapter 10 - Variation and Inheritance Flashcards
1
Q
Allele
A
Different forms of the same gene
2
Q
Phenotype
A
Physical appearance of characteristic
3
Q
Genotype
A
The genetic makeup
4
Q
Homozygous
A
Have two identical alleles e.g. DD
5
Q
Heterozygous
A
Have two different alleles e.g. Dd
6
Q
Genes
A
Short sections of DNA with the code to make specific proteins.
7
Q
Polydactyl
A
Dominant, having extra fingers or toes.
8
Q
Cystic fibrosis
A
Recessive, causes production of thick, sticky mucus.
9
Q
Sickle-cell anaemia
A
Recessive allele, affects shape of red blood cells and may block blood vessels.
10
Q
Down’s syndrome
A
Extra chromosome (mistake during meiosis)
11
Q
Screening embryos
A
Tests to diagnose genetic disorders, during pregnancy so abortion unethical.
12
Q
Humans have
A
23 pairs of chromosomes xx female xy male
