10.2 Inheritance (IBDP Biology)
Terms in this set (10)
Refers to the behaviour of homologous pairs of chromosomes or pairs of sister chromatids in meiosis.
Refers to the behaviour of alleles of unlinked genes as a result of gamete production (meiosis).
Ratio of phenotype if two heterozygous genes were crossed in a dihybrid cross.
Heterozygous at both loci x Heterozygous for one and homozygous dominant for another trait (ratio)
Heterozygous at both loci x Heterozygous/ Homozygous recessive
Pairs or groups of genes which are inherited together, carried on the same chromosome.
Recombination of alleles (gene transfer) occurs as a result of crossing-over between non-sister chromatids. Exchange of alleles gives new genotypes of gametes.
1. Gene transfer through a point called chiasmata.
2. Leads to more variation in gametes.
3. The further apart a pair of alleles are on a chromosome, the more likely it is that crossing-over may occur between them, leading to recombination.
1. It is a single characteristic controlled by multiple genes.
2. It gives rise to continuous variation in the phenotype.
3. e.g. Human SKIN COLOR and Wheat KERNEL COLOR.
4. Polygenic traits such as height and color maybe influenced by the environment of the organism.
About skin color
1. It is a result of pigments such as melanin being produced.
2. The darker the skin, the greater the protection against the harmful effects of the sun.
3. Skin colour is thought to be controlled by up to four separate genes, each with their own alleles.
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