reproduction

• What does homozygous mean?

  Organism that possesses 2 identical alleles
• What does heterozygous mean?

  Organism that possesses 2 different alleles
• What is discrete variation?

  Characteristics that can be split into specific groups
• What are examples of discrete variation?

  Blood groups

  Tongue rolling ability

  Ear lobe type
• What is continuous variation?

  Characteristics that usually range from smallest to largest values
• What are examples of continuous variation?

  Weight

  Height

  Hand span
• What is the meaning of phenotypes?

  The appearance of the organism
• What is the meaning of genotypes?

  The alleles an organism has
• What is the meaning of dominant?

  Alleles that is always expressed in the phenotype
• What is the meaning of recessive?

  Alleles that is masked by a dominant allele but is shown when paired with another recessive allele
• Describe reproduction in a plant cell

  Pollination occurs - pollen transferred to the stigma

  Pollen tube grows

  Nuclei of the male and female gamete fuse to form zygote

  Zygote has 2 sets of chromosomes
• In flowers, what is the name of the male gamete and what produces it?

  Anthers produce male gamete pollen
• In flowers, what is the name of the female gamete and what produces it?

  Ovaries produce female gamete ovules
• What chromosomes do male and female gametes contain?

  Male - X and Y chromosome

  Female - X chromosome
• Does female or male gamete determine the sex of the offspring?

  Male
• How many chromosomes does a body cell contain?

  2 sets (46) (Diploid)
• How many chromosomes does a gamete have?

  1 set (23) (Haploid)
• How many chromosomes is in a gamete?

  23 chromosomes
• How many chromosomes is in a zygote?

  46 chromosomes
• What is variation?

  Variation is brought about as fertilisation is a random process with an element of chance
• a characteristic is controlled by one more gene is continuous variation.