Mendelian inheritance specifies that if two heterozygous individuals mate, the chances that a child would be homozygous for the
1 answer:
Mendelian inheritance specifies that if two heterozygous individuals mate, the chances that a child would be homozygous for the recessive allele would be 25%.
Certain patterns of how qualities are passed from parents to children are referred to as mendelian inheritance. Gregor Mendel, an Austrian monk who conducted countless pea plant tests in the 19th century, developed these broad patterns. A chart known as a Punnett square makes it simple to ascertain the predicted ratios of potential genotypes in the offspring of two parents. The hypothetical situation shown in Figure below.
The gene in question is autosomal, and both parents have heterozygotes for it (Aa). Each parent will generate half the gametes with the A allele and half the gametes with the an allele. The potential genotypes of their offspring are revealed by filling in the Punnett square's cells.
It displays the potential genotype ratios that are most likely to occur, in this case 25% AA, 50% Aa, and 25% aa.
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Reproductive cells are haploid (have 1/2 the chromosomes), whereas somatic/body cells are diploid (have the full set of chromosomes)
This makes sense if you think about it. Using the example from the question, every dog has 78 chromosomes. This includes two of each (there are two chromosome 1's, two chromosome 2's, etc. This is visible in the karyotype attached). One set of these chromosomes were inherited from the mother, and one set from the father. Each parent contributed 39 chromosomes (one chromosome 1, one chromosome 2, etc.). If the dog in the question were to have 78 chromosomes in its sperm cells, it would contribute two sets to its offspring. When combined with the chromosomes in the egg cell, the offspring would end up with extra chromosomes. Therefore, both the sperm and the egg cells will have 39 chromosomes, one of each. When combined, they will produce offspring with 78 chromosomes, the proper number.
